List of longest tunnels explained

This list of longest tunnels ranks tunnels that are at least long. Only continuous tunnels are included. Pipelines, even those that are buried, are excluded. The longest tunnels have been constructed for water distribution, followed by tunnels for railways.__TOC__

World's longest tunnels (in use)

Type	Name	Location	Length	Year	Comment
Water supply	Delaware Aqueduct	New York State, United States	1370003NaN3	1945	4.1 m in diameter (13.2 m^2). New York City's main water supply tunnel.
Water supply	Päijänne Water Tunnel	Southern Finland, Finland	1200003NaN3	1982	16 m^2 cross section. Main water supply tunnel for southern Finland, including Helsinki, drilled through solid rock.
Metro	Suzhou Rail Transit Line 3-11	Suzhou, China	865423NaN3	2019–2023	Suzhou Rail Transit Line 11 and Line 3 are connected at Weiting station with through trains passing by. Longest metro tunnel
Water supply	Dahuofang Water Tunnel	Liaoning, China	853203NaN3	2009	8 m in diameter^[1] (50 m^2 cross section)
Water supply	Orange–Fish River Tunnel	South Africa	828003NaN3	1972	Longest continuous enclosed aqueduct in the Southern Hemisphere (22.5 m^2 cross section). Built to divert water from the Orange River to the Great Fish River.
Water supply	Bolmen Water Tunnel	Kronoberg/Scania, Sweden	820003NaN3	1987	8 m^2 cross section
Metro	Chengdu Metro Line 6	Chengdu, China	682233NaN3	2020	Longest (independent single-line) metro/rapid transit tunnel
Hydroelectric	Neelum–Jhelum Hydropower Tunnel	Muzaffarabad, Azad Kashmir, Pakistan	680003NaN3	2017	Part of the 969 MW Neelum–Jhelum Hydropower Plant
Wastewater	Tunel Emisor Oriente	Mexico City, Mexico	625003NaN3	2019^[2]	7 m in diameter. Longest wastewater tunnel.
Metro	Qingdao Metro Line 1	Qingdao, China	598183NaN3	2020–2021	Second longest metro/rapid transit tunnel
Metro	Guangzhou Metro Line 18	Guangzhou, China	583003NaN3	2021
Metro	Guangzhou Metro Line 3	Guangzhou, China	579303NaN3 (Excl. branch)	2005–2018
Metro	Moscow Metro Bolshaya Koltsevaya line	Moscow, Russia	575383NaN3^[3] ^[4] (Excl. branch)	2018–2023^[5]	Longest metro/rapid transit circular line
Railway Twin Tube	Gotthard Base Tunnel	Central Swiss Alps, Switzerland	571043NaN3 and 570173NaN3	2016	Longest conventional railway tunnel. It is also the world's longest transit tunnel by geodetic distance; 55.782km (34.661miles) between the two portals. Total 151.84km (94.35miles) of broken out tunnels through solid rocks.^[6] ^[7] Part of the NRLA.
Metro	Beijing Subway Line 10	Beijing, China	571003NaN3	2008–2013
Railway Single Tube	Seikan Tunnel	Tsugaru Strait, Japan	538503NaN3	1988	74 m^2; longest railway tunnel until 2016. Longest tunnel with an undersea section, running between Honshu and Hokkaido. Undersea section measures 23.3 kilometres (14.5 mi).
Metro	Beijing Subway Line 6	Beijing, China	534003NaN3	2012–2018
Water supply	Želivka Water Tunnel^[8]	Central Bohemian Region, Czech Republic	519703NaN3	1972	9–12 m^2
Metro	Seoul Subway Line 5	Seoul, South Korea	517003NaN3 (longest branch)	1995–2021	Longest metro/rapid transit tunnel until Guangzhou Metro Line 3 extension opened in 2010, crosses west to east under the Seoul Capital Area.
Metro	Istanbul Metro (Line M11)	Istanbul, Turkey	515003NaN3	2023-2024	Longest tunnel in Turkey
Dewatering Adit	Rothschönberger Stolln^[9]	Freiberg Mining Field, Germany	509003NaN3	1844–1882	6 m^2 cross section, longest tunnel until 1945. Part of a UNESCO World Heritage Site.
Railway Twin Tube	Channel Tunnel	English Channel, United Kingdom/France	504503NaN3	1994	Second longest railway tunnel until 2016. Longest underwater section, longest international tunnel (2×45 m^2 + 1×18 m^2), running between Folkestone, Kent, and Coquelles, Pas-de-Calais.
Railway Single Tube	Yulhyeon Tunnel	Seoul Capital Area, South Korea	503003NaN3^[10]	2016^[11]	107 m^2, part of the Suseo high-speed railway.
Water supply	River Arpa – Lake Sevan tunnel^[12] ^[13]	Armenia (at the time of construction Soviet Union)	483583NaN3^[14]	1981	Longest tunnel built to restore ecological balance. Transfers water from the Arpa to Lake Sevan to recover its level.^[15]
Water supply	Pahang – Selangor Raw Water Transfer Project^[16] ^[17]	Pahang & Selangor, Malaysia	446003NaN3	2014	5.2 m in diameter
Metro	Wuhan Metro Line 2	Wuhan, China	443473NaN3	2012–2019
Metro	Shanghai Subway Line 7	Shanghai, China	442003NaN3	2009–2010
Water supply	1 Tunnel, Yellow River Diversion to Shanxi North Line	Shanxi, China	436703NaN3	2011	See South–North Water Transfer Project
Water supply	7 Tunnel, Yellow River Diversion to Shanxi South Line	Shanxi, China	435003NaN3	2002	See South–North Water Transfer Project
Metro	Beijing Subway Line 8	Beijing, China	426003NaN3	2012–2021
Metro	Shanghai Metro Line 15	Shanghai, China	423003NaN3	2021
Metro	Chengdu Metro Line 5	Chengdu, China	423003NaN3	2019
Metro	Beijing Subway Line 14	Beijing, China	420003NaN3	2015–2021
Metro	Tianjin Metro Line 6	Tianjin, China	420003NaN3	2016–2021
Metro	Downtown line	MRT, Singapore	419003NaN3^[18] ^[19]	2013–2017	Longest rapid transit line in South East Asia
Metro	Nanjing Metro Line 3	Nanjing, China	415673NaN3	2011–2015	From Xinghuolu station to Mozhoudonglu station.
Metro	Suzhou Rail Transit Line 4	Suzhou, China	415003NaN3	2017
Metro	Serpukhovsko-Timiryazevskaya Line (Altufyevo – Bulvar Dmitriya Donskogo)	Moscow Metro, Russia (construction started at the time of Soviet Union)	414703NaN3	1983–2002
Metro	Madrid Metro Line 12 (MetroSur)	Madrid, Spain	409003NaN3	1999–2003
Metro	Tocho-mae – Shiodome – Hikarigaoka (Toei Oedo Line)	Tokyo, Japan	407003NaN3	1991–2000	Tokyo Metropolitan Bureau of Transportation
Hydroelectric	Kárahnjúkar Hydropower Plant	Fljótsdalshreppur, Iceland	397003NaN3	2003–2007	7.2–7.6 meters in diameter (45 m^2 cross section). Part of a wider complex of tunnels that are 72 kilometers in length combined.
Water supply	Quabbin Aqueduct	Massachusetts, United States	396003NaN3	1933
Metro	Chengdu Metro Line 4	Chengdu, China	393003NaN3	2015–2017
Metro	Chengdu Metro Line 7	Chengdu, China	386003NaN3	2017
Metro	Seoul Subway Line 3 (Apgujeong–Ogeum)	Seoul, South Korea	382003NaN3	1985–2010
Metro	Kaluzhsko-Rizhskaya Line (Novoyasenevskaya – Medvedkovo)	Moscow Metro, Russia (at the time of construction Soviet Union)	378003NaN3	1958–1990	Longest railway tunnel 1978–1984 and from November 1987 till March 1988; longest metro/rapid transit tunnel 1990–1995
Metro	Shenzhen Subway Luobao Line	Shenzhen, China	374973NaN3	2009–2011
Metro	Chengdu Metro Line 1	Chengdu, China	374703NaN3 (Excl. branch)	2010–2018
Water supply	Harold D. Roberts Tunnel^[20]	Colorado, United States	374643NaN3	1962	Diverts water from the Colorado River watershed to the South Platte River watershed for use in the Denver metropolitan area. Flows across Continental Divide. 4,465 feet (1,361 m) below the surface at its deepest point.
Metro	Shenzhen Subway Shekou Line	Shenzhen, China	361463NaN3	2010–2011
Water supply	Dawushan Tunnel, Niulan River Diversion to Dianchi	Yunnan, China	361373NaN3	2013
Metro	Circle line	MRT, Singapore	357003NaN3	2009–2012
Metro	Busan Metro Line 2 (Dongwon–Jangsan)	Busan, South Korea	355003NaN3	1999–2009
Railway	Songshan Lake Tunnel^[21]	Dongguan, China	353913NaN3	2016	Dongguan–Huizhou intercity railway, longest railway tunnel in China
Metro	Seoul Subway Line 6	Seoul, South Korea	351003NaN3	2001
Metro	Seoul Subway Line 7 (Cheongdam–Bupyeong-gu Office)	Seoul, Incheon, Bucheon and Gwangmyeong in South Korea	351003NaN3	2000–2012
Metro	Tianjin Metro Line 5		Tianjin, China	348003NaN3	2018–2021
Railway Single Track	Lötschberg Base Tunnel	Bernese Alps, Switzerland	345773NaN3	2007	Longest land railway tunnel until Gotthard Base Tunnel was opened; two single track tubes along 12 km, only single track along 22 km. Part of the NRLA.
Metro	Istanbul Metro (Line M4)	Istanbul, Turkey	340503NaN3	2012
Water supply	Tyne-Tees Tunnel	England, United Kingdom	340003NaN3	1983 (and earlier)	Northumbrian water supply tunnel.
Metro	Guangzhou Metro Line 8	Guangzhou, China	339003NaN3	2010–2020
Metro	Lyublinsko-Dmitrovskaya Line (Zyablikovo – Seligerskaya)	Moscow Metro, Russia (construction started at the time of Soviet Union)	334003NaN3	1995–2018
Metro	Madrid Metro Line 7	Madrid, Spain	329193NaN3	1974–2007
Railway Twin Tube	New Guanjiao Tunnel	Qinghai, China	326453NaN3	2014^[22]	Longest tunnel on the upgraded dual-track Xining–Golmud section of Qinghai–Tibet Railway, longest railway tunnel in China until 2016, 3323.58–3380.97 meters above sea level
Metro	Meijo Line – Meikō Line	Nagoya Municipal Subway, Japan	324003NaN3	1965–2004
Metro	Guangzhou Metro Line 2	Guangzhou, China	320003NaN3	2010
Metro	Rathaus Spandau–Rudow (U7)	Berlin U-Bahn, Germany	318003NaN3	1924–1984
Water supply	Gerede Water Transmission Tunnel^[23]	Ankara, Turkey	315923NaN3	2019^[24]	5.2 m in diameter
Metro	Seoul Subway Bundang Line (Seoul Forest–Jukjeon)	Seoul, Seongnam and Yongin in South Korea	314003NaN3	1994–2012
Metro	Daegu Metro Line 2	Daegu and Gyeongsan in South Korea	314003NaN3	2005–2012
Wastewater	Milwaukee Metropolitan Sewerage District Deep Tunnel Phase 1	Milwaukee County, Wisconsin, United States	312213NaN3	1993	405 million gallons of combined sewage storage designed to prevent sewage overflow into Lake Michigan. The largest of three phases, totalling 521 million gallons of storage.^[25]
Metro	Beijing Subway Line 1	Beijing, China	310403NaN3	1971–2000
Metro	Bucharest Metro Line M1	Bucharest, Romania	310103NaN3	1979–1992	8,670 m, shared with M3 line. Nether less one continuous tunnel.
Metro	Côte-Vertu – Montmorency (Line 2 Orange)	Montreal Metro, Canada	307983NaN3	1966–2007
Metro	Shanghai Subway Line 2	Shanghai, China	301873NaN3	2000
Metro	Parnas – Kupchino (line 2)	Saint Petersburg Metro, Russia (construction started at the time of Soviet Union)	301003NaN3	1961–2006
Metro	Guangzhou Metro Line 5	Guangzhou, China	299003NaN3	2009
Water supply	Shandaken Tunnel	Catskill Mountains, New York, United States	297803NaN3	1924
Metro	Shanghai Subway Line 8	Shanghai, China	296503NaN3	2007–2009
Metro	Prospekt Veteranov – Devyatkino (line 1)	Saint Petersburg Metro, Russia (at the time of construction Soviet Union)	296003NaN3	1955–1978
Metro	Shanghai Subway Line 10	Shanghai, China	296003NaN3	2010
Water supply	Evinos – Mornos Tunnel^[26] ^[27]	Aetolia-Acarnania, Greece	294003NaN3	1995
Metro	Chengdu Metro Line 2	Chengdu, China	290003NaN3	2012–2013	Only includes phases 1 and 2
Water supply	Hultman Aqueduct^[28]	Eastern Massachusetts, United States	286403NaN3	1939	11.51NaN1 to 141NaN1 diameter (15m^2 cross section); offline for rehabilitation
Metro	Sydney Metro Northwest	Sydney, New South Wales, Australia	285003NaN3	2019	The line incorporates the existing 13 km Epping to Chatswood rail link. It forms part of the wider Sydney Metro project.
Railway Twin Tube	Guadarrama Tunnel^[29]	Sierra de Guadarrama, Spain	283773NaN3	2007
Water supply	MetroWest Water Supply Tunnel^[30]	Eastern Massachusetts, United States	283003NaN3	2003	141NaN1 diameter (15m^2 cross section)
Railway Twin Tube	West Qinling Tunnel	Gansu, China	282363NaN3	2016	Chongqing–Lanzhou railway
Metro	Taipei Metro Blue Line	Taipei, Taiwan	282003NaN3	1999–2015
Metro	Beijing Subway Line 4	Beijing, China	281653NaN3	2009–2010
Metro	Seoul Subway Line 9 (Gimpo Airport–Sports Complex)	Seoul, South Korea	281003NaN3	2009–2015
Railway Single Tube	Taihang Tunnel^[31]	Taihang Mountains, China	278483NaN3	2007	On Shijiazhuang–Taiyuan high-speed railway
Metro	Morden–East Finchley (Northern line)	London Underground, England, United Kingdom	278003NaN3	1890–1940	Longest railway tunnel in UK
Metro	Shenyang Subway Line 1	Shenyang, China	278003NaN3	2010
Water supply	Melamchi Water Tunnel	Melamchi to Kathmandu, Nepal	270003NaN3	2021^[32]	See Melamchi Water Supply Project
Metro	Seoul Subway Incheon Line 1 (Bakchon–International Business District)	Incheon, South Korea	270003NaN3	1999–2009
Metro	Dainichi–Nagahara (Tanimachi Line)	Osaka Metro, Japan	269003NaN3	1967–1983
Particle accelerator	LEP Tunnel^[33]	CERN, Switzerland/France	266593NaN3	1988 (breakthrough)	11.3–15.9 m^2 circular ring, now used by Large Hadron Collider
Railway Single Tube	Hakkōda Tunnel (Tōhoku Shinkansen)	Hakkōda Mountains, Japan	264553NaN3	2010	64–74 m^2
Water supply	Şanlıurfa Irrigation Tunnels	Turkey	264003NaN3	2005^[34]
Metro	Shanghai Subway Line 9	Shanghai, China	262633NaN3	2007–2010
Hydroelectric	Gilgel Gibe II Power Station headrace tunnel	Ethiopia	260003NaN3	2005–2009	Tunnel partially collapsed, was repaired in 2010.^[35] ^[36]
Water supply	5 Tunnel, Yellow River Diversion to Shanxi South Line	Shanxi, China	260003NaN3	2002	See South–North Water Transfer Project
Metro	Daegu Metro Line 1	Daegu, South Korea	259003NaN3	1997–2002
Metro	MRT Blue Line	Bangkok, Thailand	258003NaN3	2004	Second phase will be open in April 2019
Railway Single Tube	Iwate-Ichinohe Tunnel	Ōu Mountains, Japan	258103NaN3	2002	Part of the Tōhoku Shinkansen
Water supply	Sudbury Aqueduct	Eastern Massachusetts, United States	257503NaN3	1878	Emergency backup use
Metro	Suzhou Rail Transit Line 1	Suzhou, China	257393NaN3	2007–2011
Metro	Line 3 (Athens Metro)	Athens, Greece	252003NaN3	1992–2022	Line 3 is actually 46.5 km long, but only 25.2 km of it are underground.
Metro	Helsinki metro (Kivenlahti–Sörnäinen)	Espoo and Helsinki, Finland	252003NaN3	1982–2022
Metro	Taipei Metro Orange Line (Huilong – Nanshijiao)	Taipei, Taiwan	251003NaN3 (Excl. branch)	1998–2013
Railway Twin Tube	Musil Tunnel^[37] ^[38]	Wonju–Jecheon (Jungang Line), South Korea	250803NaN3	2021^[39]
Railway Twin Tube	Pajares Base Tunnel	Asturias/León, Spain	246673NaN3	2023
Road	Lærdal Tunnel	Lærdal – Aurland, Norway	245103NaN3	2000	The longest road tunnel in the world
Metro	Yellow Line (Delhi Metro) GTB Nagar – Qutub Minar^[40]	Delhi, India	240003NaN3	2004–2010	Longest tunnel in India
Metro	Madrid Metro Line 1	Madrid, Spain	238763NaN3	1919–2007
Railway	Lainzer/Wienerwaldtunnel	west of Vienna, Austria	238443NaN3	2012	Breakthrough 2007
Wastewater	Harbour Area Treatment Scheme (HATS) Stage 1^[41]	Hong Kong, China (construction started in British Hong Kong)	236003NaN3	2001
Water supply	Eucumbene-Snowy Tunnel^[42]	New South Wales, Australia	235003NaN3	1965	Part of the 145 km tunnel network of the Snowy Mountains Scheme
Railway	South Lüliangshan Tunnel^[43]	Shanxi, China	234733NaN3	2014^[44]	2 tubes, part of Shanxi–Henan–Shandong railway
Metro	Madrid Metro Line 6	Madrid, Spain	234723NaN3	1979–2007
Metro	Angrignon – Honoré-Beaugrand (Line 1 Green)	Montreal Metro, Canada	232623NaN3	1966–2007
Metro	Warsaw Metro Line 1 Kabaty – Młociny	Warsaw, Poland	231003NaN3	1983–2008
Metro	Beijing Subway Line 2	Beijing, China	231003NaN3	1969–1987
Hydroelectric	Xinma Hydroelectric Power Station Water Tunnel	Sichuan, China	229753NaN3	2009
Railway	Iiyama Tunnel^[45]	Iiyama, Japan	222253NaN3	2015	Part of the Hokuriku Shinkansen
Railway	Daishimizu Tunnel	Mount Tanigawa, Japan	222213NaN3	1982	Longest railway tunnel until Seikan Tunnel was opened.
Water supply	Eucumbene-Tumut Tunnel	New South Wales, Australia	222003NaN3	1959	Part of the 145 km tunnel network of the Snowy Mountains Scheme
Road	WestConnex	Sydney, New South Wales, Australia	218003NaN3	2023 (2019–2020 partial completion)	New M4 Tunnels opened 2019, WestConnex M8 opened 2020
Railway	Daegwallyeong Tunnel	Pyeongchang–Gangneung (Gyeonggang Line), South Korea	217553NaN3	2017^[46]
Water supply	Vorotan–Arpa Tunnel^[47]	Armenia (construction started at the time of Soviet Union)	216523NaN3	2004
Particle accelerator (incomplete)	UNK proton accelerator	Protvino, Russia (construction started at the time of Soviet Union)	210003NaN3	1994 (breakthrough)	Construction stopped after finishing of main circle tunnel, future is unclear
Metro	Guangfo Metro	Foshan, China	209003NaN3	2010
Railway Twin Tube	Luliangshan Tunnel	Shanxi, China	207853NaN3	2011	2 tubes: left tube is 20785 meters, right tube is 20738 meters
Metro	Shanghai Subway Line 4	Shanghai, China	207403NaN3	2005–2007
Metro	Barcelona Metro Line 1	Barcelona, Spain	207003NaN3	1926–1992
Hydroelectric	Ward Tunnel	California, United States	206103NaN3	1920–1925	Part of the Big Creek Hydroelectric Project of the Southern California Edison Company. Excavated through solid granite.
Metro	Busan Metro Line 1 (Hadan-Busan Nat'l Univ. of Education)	Busan, South Korea	206003NaN3	1985–1994
Metro	Xian Subway Line 2	Xi'an, China	205003NaN3	2011
Metro	Daejeon Metro Line 1	Daejeon, South Korea	204703NaN3	2006–2007
Metro	Nanjing Metro Line 2	Nanjing, China	203803NaN3	2010
Metro	Shanghai Subway Line 6	Shanghai, China	203363NaN3	2007
Railway	Geumjeong Tunnel^[48]	Busan, South Korea	203233NaN3	2010	Gyeongbu high-speed railway
Railway Twin Tube	Wushaoling Tunnel	Wuwei, China	200603NaN3	2006–2007	2 tubes: left tube is 20060 meters, right tube is 20050 meters
Water supply	Olmos Transandino Project	Guabal, Peru	200003NaN3	2011^[49]
Metro	Istanbul Metro (Line M5)	Istanbul, Turkey	200003NaN3	2017–2018	M5 line (Üsküdar-Çekmeköy) is 20 km with depot line. Line is 30.9 km with Çekmeköy-Sultanbeyli Phase.
Electric power transmission tunnel	The London Connection^[50]	London, England, United Kingdom	200003NaN3	2005^[51]	National Grid plc, 3-metre diameter, 400 kilovolt circuit
Railway Twin Tube	Simplon Tunnel	Lepontine Alps, Switzerland/Italy	198033NaN3	1906	Parallel tunnel was opened in 1922 (19,824 m long); longest transit tunnel until Daishimizu Tunnel was opened. Part of the NRLA.
Hydroelectric	Tunnel	Colcabamba, Peru	198003NaN3	1973^[52]
Railway	Shin Hokuriku Tunnel	Fukui Prefecture, Japan	197603NaN3	2024	Part of the Hokuriku Shinkansen
Railway	Follo Line	Oslo, Norway	195003NaN3	2022^[53] ^[54]	Groundbreaking 2014^[55]
Metro	Koltsevaya Line (Circle Line)	Moscow Metro, Russia (at the time of construction Soviet Union)	194003NaN3	1950–1954
Hydroelectric	Futang Hydroelectric Power Station Water Tunnel	Sichuan, China	193193NaN3	2004^[56]
Metro	Seoul Subway Bundang Line (Suwon station–Jukjeon station)	Yongin and Suwon in South Korea	193003NaN3	2007–2013
Railway Single Tube	Qamchiq Tunnel^[57]	Angren–Pap railway, Uzbekistan	192003NaN3	2016	Longest non-metro railway tunnel in ex-USSR
Metro	North East line	MRT, Singapore	192003NaN3	2003–2011	World's first fully automated and driverless underground rapid transit line
Metro	Suzhou Rail Transit Line 2	Suzhou, China	191463NaN3	2009–2012
Metro	Maskoŭskaja Line	Minsk Metro, Belarus (construction started at the time of Soviet Union)	191003NaN3	1984–2014
Railway Single Track	Vereina	Silvretta, Switzerland	190583NaN3	1999	Single track with passing loops, metre gauge
Metro	Seoul Subway Line 4 (Ssangmun–Ichon)	Seoul, South Korea	190003NaN3	1980
Wastewater	Harbour Area Treatment Scheme (HATS) Stage 2^[58]	Hong Kong, China	188003NaN3	2015
Railway	Shin-Kanmon Tunnel	Kanmon Straits, Japan	187133NaN3	1975	Part of the San'yō Shinkansen
Hydroelectric	Shiziping Hydroelectric Power Station Water Tunnel	Sichuan, China	187123NaN3	2010^[59]
Railway Single Tube	Vaglia	Bologna – Firenze, Italy	187113NaN3	2009	Bologna–Florence high-speed railway
Hydroelectric	Baoxing Hydroelectric Power Station Water Tunnel	Sichuan, China	186763NaN3	2007
Railway Single Tube	Apennine Base Tunnel	Tuscan-Emilian Apennines, Italy	185073NaN3	1934
Metro	Obolonsko–Teremkivska line	Kyiv Metro, Ukraine (construction started at the time of Soviet Union)	184803NaN3	1976–2013
Metro	Istanbul Metro (Line M3)	Istanbul, Turkey	184603NaN3	2013-2022
Railway Twin Tube	Qinling Tunnel I-II	Qin Mountains, China	184603NaN3	2000	2 tubes: left tube is 18460 meters, right tube is 18456 meters^[60]
Hydroelectric	Tatev Hydroelectric Power Station Water Tunnel	Armenia (at the time of construction Soviet Union)	184003NaN3	1970
Road Twin Tube	Yamate Tunnel	Tokyo, Japan	182003NaN3	2015
Railway	South Taihangshan Tunnel	Shanxi, China	181253NaN3	2014^[61]	2 tubes, part of Shanxi–Henan–Shandong railway
Metro	Shanghai Subway Line 1	Shanghai, China	181103NaN3	1995
Metro	Avtozavodskaya Line	Minsk Metro, Belarus (construction started at the time of Soviet Union)	181003NaN3	1990–2005
Road Twin Tube	Zhongnanshan Tunnel	Shaanxi, China	180403NaN3	2007	The longest road tunnel in China
Metro	Line 2 (Athens Metro)^[62]	Athens, Greece	179003NaN3	1991–2013
Metro	Beijing Subway Line 5	Beijing, China	178253NaN3	2007
Hydroelectric	Shuakhevi headrace and pressure tunnel	Shuakhevi, Adjara, Georgia	178003NaN3^[63]	2013–2017
Metro	Ankara Metro (AKM-Koru)	Ankara, Turkey	196603NaN3	1997–2014	M1 line is tunnel in Kızılay between AKM, M2 line is completely underground.
Road	Jingpingshan	Sichuan, China	175003NaN3	2008	The deepest transportation tunnel in China
Metro	Shenzhen Subway Longgang Line	Shenzhen, China	173333NaN3	2010–2011
Metro	Kholodnohirsko–Zavodska Line	Kharkiv Metro, Ukraine (at the time of construction Soviet Union)	173003NaN3	1975–1978
Metro	Seoul Subway Shinbundang Line	Seoul and Seongnam in South Korea	173003NaN3	2011
Water supply	Mavi Tünel (Blue Tunnel)^[64]	Konya, Turkey	170343NaN3	2012	Breakthrough 2007
Road	Gotthard Road Tunnel	Lepontine Alps, Switzerland	169183NaN3	1980
Metro	Guangzhou Metro Line 4	Guangzhou, China	167903NaN3	2005
Metro	İzmir Metro Line M1	İzmir, Turkey	167503NaN3	2000–2023
Metro	Barcelona Metro Line 4	Barcelona, Spain	167003NaN3	1929–1999
Metro	Seoul Subway Line 2 (Jamsil–Sillim)	Seoul, South Korea	167003NaN3	1980–1984
Metro	Barcelona Metro Line 3	Barcelona, Spain	166003NaN3	1924–2001
Metro	Barcelona Metro Line 5	Barcelona, Spain	166003NaN3	1959–1983
Water supply	Murrumbidgee-Eucumbene Tunnel	New South Wales, Australia	166003NaN3	1961	Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro	Istanbul Metro (Line M2)	Istanbul, Turkey	165003NaN3	2000–2009
Metro	Beijing Subway Line 9	Beijing, China	165003NaN3	2011–2012
Hydroelectric	Jinkang Hydroelectric Power Station Water Tunnel	Sichuan, China	164903NaN3	2006
Metro	Madrid Metro Line 8	Madrid, Spain	164673NaN3	1998–2007
Metro	Guangzhou Metro Line 1	Guangzhou, China	164493NaN3	1997
Metro	Madrid Metro Line 3	Madrid, Spain	164243NaN3	1939–2007
Railway	Rokkō Tunnel^[65]	Mount Rokkō, Japan	162503NaN3	1972	Part of the San'yō Shinkansen
Railway	Solan Tunnel^[66]	Taebaek, Gangwon-do, South Korea	162403NaN3	2012	Taebaek Line, includes a spiral
Hydroelectric Twin Tube	Kemano T1 and T2^[67]	Kemano, Canada	160003NaN3	1954; 2022	T1 was completed in 1954 and T2 was completed in May, 2022,^[68] both are in operation.
Metro	Seoul Subway Line 7 (Suraksan–Konkuk University)	Seoul, South Korea	160003NaN3	1996
Railway		Tyrol, Austria	159903NaN3	2012
Railway	Xiangshan Tunnel 象山隧道	Fujian, China	159173NaN3	2012	2 tubes, part of Longyan–Xiamen Railway
Railway		Tyrol, Austria	158403NaN3	2012
Former railway	Henderson Tunnel^[69] ^[70]	Front Range, United States	158003NaN3	1976	Narrow gauge railway, replaced by a conveyor belt in 1999. Only one portal (served an underground mine)^[71]
Metro	Istanbul Metro (Line M9)	Istanbul, Turkey	158003NaN3	2013–2024
Water supply	Pandaoling Tunnel, Datong River Diversion to Shaanxi Project	Shaanxi, China	157233NaN3	1994
Metro	Copenhagen Metro City Circle Line	Denmark	155003NaN3	2019	Longest railway tunnel in Denmark and Scandinavia
Metro	Budapest Metro: Line 3^[72]	Hungary	155003NaN3	1976–1990	Line 3 is actually 17.39 km long, but only 15.5 km of it is underground.
Railway Single Track	Furka Base	Urner Alps, Switzerland	154423NaN3	1982	Single track with passing loops, metre gauge
Railway Twin Tube	Ceneri Base Tunnel	Lepontine Alps, Switzerland	154003NaN3	2020	Part of the NRLA
Metro	Seoul Subway Line 3 (Gupabal–Geumho)	Seoul, South Korea	154003NaN3	1985
Metro	Tianjin Subway Line 1	Tianjin, China	153783NaN3	1976–2006
Railway	Haruna Tunnel	Gunma Prefecture, Japan	153503NaN3	1982	Part of the Jōetsu Shinkansen
Railway Single Track	Severomuysky Tunnel	Severomuysky Range, Russia (construction started at the time of Soviet Union)	153433NaN3	2003
Wastewater	Deer Island Outfall Tunnel^[73]	Deer Island, Boston, Massachusetts, United States	152903NaN3	2000	241NaN1 diameter (42m^2 cross section); discharges treated effluent into Atlantic Ocean
Railway Single Tube	Firenzuola	Bologna – Firenze, Italy	152853NaN3	2009	Bologna–Florence high-speed railway
Hydroelectric	Inguri Hydroelectric Power Station Water Tunnel	Georgia (at the time of construction Soviet Union)	152793NaN3	1978
Metro	Shanghai Subway Line 2	Shanghai, China	152743NaN3	2000	Between Zhanjianggaoke station and Lingkong Station
Water supply	Jinquidi Tunnel, Niulan River Diversion to Dianchi	Yunnan, China	152573NaN3	2013
Hydroelectric	Baotan Hydroelectric Power Station Water Tunnel	Guangxi, China	152003NaN3	2010
Railway	Gorigamine Tunnel	Nagano Prefecture, Japan	151753NaN3	1997	Part of the Hokuriku Shinkansen
Hydroelectric	Xuecheng Hydroelectric Power Station Water Tunnel^[74]	Sichuan, China	151743NaN3	2007
Railway Single Track	Monte Santomarco	Paola – Cosenza, Italy	150403NaN3	1987
Railway Single Tube	Gotthard Rail Tunnel	Lepontine Alps, Switzerland	150033NaN3	1882	Longest transit tunnel until Simplon Tunnel was opened.
Metro	Gwangju Metro Line 1 (Sotae station–Dosan station)	Gwangju, South Korea	150003NaN3	2004
Railway	Nakayama Tunnel	Gunma Prefecture, Japan	148573NaN3	1982	Part of the Jōetsu Shinkansen
Water supply	Dangara Irrigation Tunnel^[75]	Nurek, Tajikistan (at the time of construction Soviet Union)	148003NaN3	1987
Railway	Cuajone-El Sargento	Ilo-Toquepala / Cuajone Industrial Railroad – Southern Peru Copper Corporation, Peru	147243NaN3^[76]	1975
Railway Single Tube	Mount Macdonald Tunnel	Rogers Pass, Glacier National Park, Canada	147233NaN3	1989
Railway (Maglev)	Misaka Sasago Tunnel	Yamanashi, Japan	146133NaN3	1996	Part of the Chuo Shinkansen (Maglev). Already used as Yamanashi Test Track since 1996.
Railway Single Tube	Lötschberg Tunnel	Bernese Alps, Switzerland	146123NaN3	1913
Water supply	Caoe River Diversion Project	Zhejiang, China	146003NaN3	2011
Railway Single Tube	Romerike Tunnel	Oslo – Lillestrøm, Norway	145803NaN3	1999
Railway	Fajiushan Tunnel^[77]	Shanxi, China	145733NaN3	2014	Part of Shanxi–Henan–Shandong railway.
Water supply	Snowy-Geehi Tunnel	New South Wales, Australia	145003NaN3	1966	Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro	Seoul Subway Line 4 (Isu–Beomgye)	Seoul, Gwacheon and Anyang in South Korea	145003NaN3	1980–1994
Road	Zigana Tunnel	Torul–Maçka, Turkey	144813NaN3^[78]	2023^[79]	Longest road tunnel in Turkey
Hydroelectric	Jisha Hydroelectric Power Station Water Tunnel	Yunnan, China	144673NaN3	2007
Road Twin tube	Ryfylke Tunnel	Stavanger–Strand, Norway	144003NaN3	2019	Longest underwater road tunnel in the world
Water supply	6 Tunnel, Yellow River Diversion to Shanxi South Line	Shanxi, China	144003NaN3	2002	See South–North Water Transfer Project
Water supply	Ala Mountain Pass Water Supply Project	Xinjiang, China	143463NaN3	2010
Road Twin Tube	Ovit Tunnel^[80]	Erzurum Province–Rize Province, Turkey	143463NaN3	2018
Metro	Stockholm Metro: Tunnelbana 3 (Blue Line) Kungsträdgården–Hjulsta	Stockholm, Sweden	143003NaN3	1975–1977
Railway Single Tube	Dayaoshan Tunnel^[81]	Nanling Mountains, China	142943NaN3	1987
Metro	Istanbul Metro (Line M8)	Istanbul, Turkey	142703NaN3	2023^[82]
Hydroelectric	Zaramag Hydroelectric Power Station Water Tunnel^[83] ^[84]	Ardon River, North Ossetia, Russia	142263NaN3	2015^[85]
Water supply	Tooma-Tumut Tunnel	New South Wales, Australia	142003NaN3	1961	Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro	Metro Lisbon – Blue (Seagull) Line	Lisbon, Portugal	140003NaN3	1959–2007
Metro	MTR – Island line (West of Heng Fa Chuen)	Hong Kong, China (construction started at the time of British Hong Kong)	140003NaN3	1985–2014
Road	Arlberg Road Tunnel	Arlberg, Austria	139723NaN3	1978
Water supply	Shanggongshan Tunnel, Zhangjiuhe Water Supply Project	Yunnan, China	139413NaN3	2007
Hydroelectric	Dayingshan #4 Hydroelectric Power Station Water Tunnel	Yunnan, China	139323NaN3	2009	8.5 m in diameter (57m^2 cross section)
Railway	Hokuriku Tunnel	Fukui Prefecture, Japan	138703NaN3	1962	Part of the Hokuriku Main Line
Railway Single Tube	Xiapu Tunnel	Fujian, China	138383NaN3	2009
Railway Twin Tube	Yesanguan Tunnel	Hubei, China	138383NaN3	2010	Tube I: 13838 meters, tube II: 13796 meters
Hydroelectric	Centrala Hidroelectrică Lotru-Ciunget	Ciungetu, Romania	137193NaN3	1972	5 m in diameter
Railway Single Tube	Fréjus (Mont Cenis)	Alps, France/Italy (construction started in the Kingdom of Sardinia)	136573NaN3	1871	Longest transit tunnel until Gotthard Tunnel was opened.
Road Twin Tube	Xishan Tunnel	Shanxi, China	136543NaN3	2012	Left tube: 13654 meters, right tube: 13570 meters
Railway Single Tube	North Tianshan Tunnel	Xinjiang, China	136103NaN3	2009
Railway	Marmaray	Istanbul, Turkey	136003NaN3	2013	Built next to a fault zone, between two continents
Railway Single Track	Savio Rail Tunnel	Helsinki – Kerava, Finland	135753NaN3	2008
Metro	Busan Metro Line 3 (Suyeong–Deokcheon)	Busan, South Korea	135003NaN3	2005
Railway Twin Tube	Shin Shimizu Tunnel	Mount Tanigawa, Japan	135003NaN3	1967	Part of the Jōetsu Line
Road	Mount Erlang Tunnel	Sichuan, China	134333NaN3	2018	Erlangshan extra-long tunnel part of Yakang Expressway
Railway Single Track	Hex River Tunnel^[86]	Hex River Pass, South Africa	134003NaN3	1989
Railway	Wonhyo Tunnel^[87] ^[88]	Ulsan, South Korea	132703NaN3	2010	Gyeongbu high-speed railway
Railway Single Tube	Dabieshan Tunnel	Hubei, China	132563NaN3	2008
Railway	Schlern Tunnel^[89]	South Tyrol, Italy	131593NaN3	1993
Railway Single Tube	Caponero-Capoverde	Genova – Ventimiglia, Italy	131353NaN3	2001	Includes an underground station ("San Remo")
Road Twin Tube	Hongtiguan Tunnel	Shanxi, China	131223NaN3	2013	Left tube: 13122 meters, right tube: 13098 meters
Metro	Barcelona Metro line 2	Barcelona, Spain	131003NaN3	1985–1997
Railway	Aki Tunnel	Hiroshima Prefecture, Japan	130303NaN3	1975	Part of the San'yō Shinkansen
	Many more tunnels exist that are shorter than 13000m (43,000feet)<					-- Please do not add shorter tunnels, limit is 13 km or 8 miles
Road Twin Tube	Guigala Tunnel	Tibet, China	127803NaN3	2023^[90]	Construction started in January 2017. It bypasses Guigala Pass between Lhasa and Shannan and is situated on a plateau with an average altitude of more than 4,300 meters. Once completed, it will become the longest road tunnel in the world at an altitude of over 4000m.
Possibly incomplete table. Many more tunnels are under construction that will be shorter than 13km (08miles)--><						-- Please do not add shorter tunnels, limit is 13 km or 8 miles -->

World's longest tunnels (under construction)

Type	Name	Location	Length	Year	Comment
Water Supply	Kashuang Water Tunnel	Xinjiang, China	2800003NaN3	(??)	Water transfer from the snow melt of Altai Mountains to the arid region of Xinjiang^[91]
Water Supply	New York City Water Tunnel No. 3	New York State, United States	965603NaN3	2026^[92]	More water supply for New York City. Partially in use.
Metro	Paris Métro Line 15	Paris/Île-de-France, France	750003NaN3	2025–2030	Circular line
Railway Twin Tube	Mont d'Ambin Base Tunnel	Cottian Alps, France/Italy	575003NaN3	2032^[93]	Part of the Lyon–Turin high-speed railway. Reconnaissance tunnels under construction since 2002; construction of main tunnel started in 2016.^[94]
Railway Twin Tube	Brenner Base Tunnel	Stubai Alps, Austria/Italy	550003NaN3	2032^[95]	Construction started in March 2015. Together with the already constructed Inntal Tunnel it will form the world's longest continuous railway tunnel with 64 km.^[96] ^[97]
Metro	Thomson–East Coast Line	MRT, Singapore	430003NaN3	2024	Excluding planned extension
Railway	Yigong tunnel	Tibet, China	425003NaN3^[98]	2030	Part of the Sichuan–Tibet railway. Construction started in November 2020.^[99]
Metro	Athens Metro Line 4	Athens, Greece	382003NaN3^[100]	2029	Construction of 1st phase started in June 2021,^[101] total length may be changed.
Railway	Sejila tunnel	Tibet, China	379003NaN3^[102]	2030	Part of the Sichuan–Tibet railway. Construction started in November 2020.^[103]
Railway (Maglev)	Daiichi Shutoken Tunnel	Tokyo, Japan	369243NaN3	After 2027	Part of the Chuo Shinkansen (Maglev)
Mineral transportation	Woodsmith Mine Tunnel Potash Project Mineral Transport System (MTS)	North York Moors, United Kingdom	367003NaN3^[104]	(??)^[105]	6 m in diameter^[106] incorporating conveyor and maintenance access. Start of construction was planned for 2016, but actually started in April 2019.^[107] ^[108]
Railway	Gaoligongshan Tunnel	Yunnan, China	345383NaN3	2025^[109]	Railway between Dali and Ruili. Construction started in August 2017.^[110]
Railway (Maglev)	Daiichi Chukyoken Tunnel	Nagoya, Japan	342103NaN3	After 2027	Part of the Chuo Shinkansen (Maglev)
Metro	L9	Barcelona, Spain	330003NaN3	(??) (2009–2016 partial completion)	Excluding branches. Northern section of the line is in operation since 2009-12-13. Southern section of the line is in operation since 2016-02-12. Future of central section is unclear.
Railway Twin Tube	Koralm Tunnel	Koralpe, Austria	329003NaN3	2026^[111]	Part of the Koralm Railway; boring of main tunnel started at the west portal in May 2010.^[112]
Railway	Oshima Tunnel	Hokkaido, Japan	326753NaN3	2031	Part of the Hokkaido Shinkansen.
Metro	Cross Island Line	MRT, Singapore	29000m (95,000feet)^[113] (Phase 1 only)	2030 (Phase 1) 2032 (Phase 2)	Construction of Phase 1 started in January 2023^[114]
Water Supply	NCP Canal Main Tunnel	Anuradhapura East, Sri Lanka	278003NaN3	2025	Part of North Central Province Canal under Mahaweli Development programme. Low slope tunnel with gravity flow, 8m in diameter. Supplies water from Moragahakanda Reservoir to North Central and Northern Provinces.^[115]
Railway Twin Tube	Valico Tunnel	Ligurian Apennines, Italy	273423NaN3^[116]	2026	Breakthrough in September 2020.^[117] Part of the Tortona–Genoa high-speed railway.
Railway Twin Tube	Semmering Base Tunnel	Lower Austria/Styria, Austria	273003NaN3	2030^[118]	Construction of the first contract section started in January 2014.^[119] Will cut travel time between Vienna and Graz by 30 minutes and is part of the Baltic–Adriatic Corridor
Road	Rogfast tunnel	Randaberg–Bokn, Norway	267003NaN3	2033^[120]	Construction started in January 2018, halted October 2019 due to expected cost overruns, revised plan and 48% cost increase approved November 2020; construction restarted late 2021.^[121] Will be the longest road tunnel in the world, and also the deepest undersea tunnel, 392m (1,286feet) below sea level. It will also have a 41003NaN3 connection tunnel from Kvitsøy to the main tunnel.
Railway	Sasson Tunnel	Hokkaido, Japan	262303NaN3	2031	Part of the Hokkaido Shinkansen.
Metro	Suburban Rail Loop East	Melbourne, Victoria, Australia	26000m (85,000feet)	2035^[122]	Construction started in June 2022.^[123] SRL North is still under early planning, projected to be completed by 2053.
Water Supply	Mae Taeng–Mae Ngat Tunnel^[124]	Chiang Mai, Thailand	256243NaN3	(??)^[125]	4 m in diameter. This tunnel is a part of "Mae Taeng–Mae Ngat–Mae Kuang Diversion Tunnel Project"
Railway (Maglev)	Minami Alps Tunnel	Akaishi Mountains, Japan	250193NaN3	After 2027	Part of the Chuo Shinkansen (Maglev)
Railway (Maglev)	Chuo Alps Tunnel	Kiso Mountains, Japan	232883NaN3	After 2027	Part of the Chuo Shinkansen (Maglev)
Metro	Metro Manila Subway	Metro Manila, Philippines	231603NaN3	2028	Only for the dedicated mainline between and .^[126] To be partially opened in 2025.^[127]
Road Twin Tube	Sengli Daban Tunnel	Xinjiang, China	220353NaN3	2026^[128]	Construction started in 2020. It bypasses Sengli Daban mountain pass which sits up at 4091 meters above the sea level. Once completed, it will become the longest road tunnel in the world at an altitude of over 4000m.
Railway	Thane Creek Tunnel^[129]	Mumbai, India	211503NaN3^[130]	2028^[131]	Part of the Mumbai–Ahmedabad high speed railway, construction started in November 2023,^[132] 13 m diameter.^[133]
Railway	Keylong Rail & Road Tunnel	Kyelang, India	211503NaN3		Part of the Bhanupali-Leh Railway & Roadway Corridor, construction started in February 2024.
Railway Twin tube	Alia Tunnel^[134]	Sicily, Italy	199003NaN3^[135]	2030^[136]	Part of the Palermo–Catania high-speed railway
Railway Twin tube	Bentong Tunnel (Genting Tunnel)	Bentong, Pahang, Malaysia	180003NaN3	2027	Part of MRL East Coast Rail Link project. Will became the longest tunnel in South East Asia^[137]
Railway	Shiribeshi Tunnel	Hokkaido, Japan	179753NaN3	2031	Part of the Hokkaido Shinkansen.
Road and railway	Fehmarn Belt Fixed Link	Fehmarn Belt, Germany/Denmark	176003NaN3	2029^[138]	Construction started in January 2021^[139]
Railway	Tateiwa Tunnel	Hokkaido, Japan	169803NaN3	2031	Part of the Hokkaido Shinkansen.
Road	Förbifart Stockholm^[140]	Stockholm, Sweden	165003NaN3	2030^[141]	Construction started in August 2014
Road	Tokyo Gaikan Tunnel	Tokyo, Japan	162003NaN3	2030	Part of the C3 Tokyo Gaikan Expressway.
Railway	Zhoushan underwater tunnel	Zhejiang, China	162003NaN3^[142]	2026	Part of the Ningbo–Zhoushan railway. Construction started in December 2020.^[143]
Railway Twin Tube	Chiltern tunnel	Chiltern Hills, United Kingdom	160403NaN3	2029-2033^[144]	Part of High Speed 2,^[145] construction started in May 2021,^[146] 9.1 m internal diameter^[147]
Railway	Uchiura Tunnel	Hokkaido, Japan	155603NaN3	2031	Part of the Hokkaido Shinkansen.
Railway (Maglev)	Ina Sanchi Tunnel	Nagano, Japan	153003NaN3	After 2027	Part of the Chuo Shinkansen (Maglev)
Railway	Devprayag Rail Tunnel	Uttarakhand, India	152703NaN3	2024–2025	Part of Rishikesh–Karnaprayag line^[148]
Railway (Maglev)	Hiyoshi Tunnel	Gifu, Japan	145323NaN3	After 2027	Part of the Chuo Shinkansen (Maglev)
Road	Zoji-la Tunnel	Zoji La Pass, India	142003NaN3^[149]	2026	Construction started in October 2020^[150]
Railway	Patalpani Rail Tunnel	Madhya Pradesh, India	140003NaN3	2025
Metro	MRT Orange Line^[151]	Bangkok, Thailand	137703NaN3	2025	Orange Line Phase 1
Railway Twin Tube	Northolt tunnel	West London, United Kingdom	135003NaN3	2029-2033	Part of High Speed 2, construction started in October 2022.^[152]
Metro	İzmir Metro Line M2	İzmir, Turkey	135003NaN3^[153]	2026
Metro	Istanbul Metro (Line M12)	Istanbul, Turkey	130303NaN3	2025

World's longest tunnels (advanced planning stage)

Type	Name	Location	Length	Year	Comment
Water supply	Tibet Xinjiang Tunnel	Tibet/Xinjiang, China	10000001NaN1	???	China preparing world's longest tunnel to divert Tibet river to desert^[154]
Railway	Bohai Strait tunnel	Bohai Strait, China	1230001NaN1	???	Tunnel between Dalian on the Liaodong Peninsula and Yantai on the Shandong Peninsula.
Railway	Talsinki	Helsinki/Tallinn, Finland/Estonia	1000001NaN1	After 2030	Awaiting financing
Water supply	Qinling Tunnel, Han River Diversion to Wei River	Shaanxi, China	983001NaN1	???
Railway	Serra do Mar Tunnel^[155]		300001NaN1	???
Road	Suðuroyartunnilin	Faroe Islands, linking Suðuroy island to Sandoy island	260001NaN1	After 2030	Feasibility study
Railway Twin Tube	Tachlovice Tunnel	Prague/Beroun, Czech Republic	247001NaN1^[156]	After 2035	Project is on hold
Metro	İzmir Metro Line M3	İzmir, Turkey	223003NaN3	2020s
Metro	Istanbul Metro (Line M13)	Istanbul, Turkey	219001NaN1	2020s
Railway and electricity	Grimsel Tunnel	Grimsel Pass, Switzerland	217201NaN1^[157]	2025/2026	Feasibility study
Railway Twin tube	Pacheco Pass Tunnels	Pacheco Pass, California, United States	210001NaN1	2031	To be built as part of the California High-Speed Rail project
Road Twin tube	Gohpur – Numaligarh Tunnel	Assam, India	156003NaN3^[158]	???	Tunnel under the Brahmaputra River
Road Twin tube	Kresna Gorge Tunnel^[159]	Kresna, Bulgaria	154001NaN1	Cancelled	Part of Struma motorway, connecting Sofia and Athens.
Road Twin tube	Agua Negra Tunnel	Agua Negra Pass, Argentina/Chile	140001NaN1	???	Awaiting ratification by Chile

World's longest tunnels (proposed)

• Bass Strait Tunnel
• Bering Strait crossing
• Gibraltar Strait Tunnel
• Japan–Korea Undersea Tunnel
• Taiwan Strait Tunnel Project

See also

• List of long tunnels by type – contains separate tables for railroad, subway, vehicular, bicycle, water/aqueducts, and also for different building techniques
• List of deepest caves
• List of deepest mines
• Lists of tunnels
• List of longest railway tunnels
  • List of long railway tunnels in China
• List of longest subway tunnel sections
• List of longest bridges

Notes and References

1. Web site: Dahuofang Water Tunnel | The Robbins Company . Robbinstbm.com . 2016-02-01 . 22 March 2012 . https://web.archive.org/web/20120322170135/http://www.robbinstbm.com/case-study/dahuofang-water-tunnel/ . live .
2. Web site: Tras 11 años de construcción, inauguran el Túnel Emisor Oriente. 23 December 2019. 22 January 2022. 21 January 2022. https://web.archive.org/web/20220121234839/https://www.animalpolitico.com/2019/12/tunel-emisor-oriente-inundaciones-inauguracion/. live.
3. Web site: Не 70 км, а 57,5! Как московские власти «удлинили» Большую кольцевую линию метро . 22 March 2023 . 25 July 2023 . 27 March 2023 . https://web.archive.org/web/20230327191629/https://1520today.ru/blog/ne-70-km-a-57-5-kak-moskovskie-vlasti-udlinili-bolshuju-kolcevuju-liniju-metro . live .
4. Web site: IMG 20230327 063939 969 — Postimages . 25 July 2023 . 27 March 2023 . https://web.archive.org/web/20230327034230/https://postimg.cc/bsQtrNg0 . live .
5. First stretch opens in 1969 as part of line 2
6. Web site: Project data – raw construction Gotthard Base Tunnel . 1 June 2016 . AlpTransit Gotthard Ltd . Lucerne, Switzerland . 2016-12-15 . 11 March 2016 . https://web.archive.org/web/20160311190816/https://www.alptransit.ch/fileadmin/dateien/media/zahlen_und_fakten/gbt_e.pdf . live .
7. News: Wer hat die grösste Röhre? . Who has the longest tube? . graphical animation . . Zurich, Switzerland . 14 April 2016 . de . 2016-05-11 . 29 April 2016 . https://web.archive.org/web/20160429131605/http://www.tagesanzeiger.ch/wissen/technik/Wer-hat-die-groesste-Roehre/story/14922381 . live .
8. Web site: Vladislav. Mug. Vladislav. Konvicka. Underground World: Stola Water Delivery Conduit from the Water Tank Želivka to Prague. Štolový vodovodní přivaděč z vodní nádrže Želivka do Prahy. cs. 2009. 27 February 2010. 17 August 2014. https://web.archive.org/web/20140817065627/http://translate.google.com/translate?hl=en&sl=cs&tl=en&u=http%3A%2F%2Fwww.hornictvi.info%2Fpodzemi%2Fzelivka%2F02.htm. live.
9. Web site: 125 Jahre Rothschönberger Stolln . 2022-12-26 . Wagenbreth . Otfried . 2002 . de . 4 April 2023 . https://web.archive.org/web/20230404080438/https://slon.diamo.cz/hpvt/2002/sekce/tradice/T%2002.htm . live .
10. Web site: Korea completes record setting rail excavation. Tunneltalk.com. 16 June 2019.
11. Web site: - Official Korea Tourism Organization. english.visitkorea.or.kr. 16 June 2019. 18 April 2022. https://web.archive.org/web/20220418171646/https://english.visitkorea.or.kr/enu/AKR/FU_EN_15.jsp?cid=2441781. dead.
12. Web site: Гидроспецпроект/Arpa-Sevan connecting tunnel. gidrospetsproekt.ru. 16 June 2019. 6 November 2020. https://web.archive.org/web/20201106180250/http://gidrospetsproekt.ru/en/geografiya-obektov/image-map_rossija/armeniya/arpa-sevan-connecting-tunnel.html. live.
13. Web site: 1961-1981 the Complex of Hydraulic Works for Transfer of the Arpa and Yeghegis | Arpa Sevan. 21 January 2022. 22 November 2021. https://web.archive.org/web/20211122052928/http://arpa-sevan.am/en/1961-1981-the-complex-of-hydraulic-works-for-transfer-of-the-arpa-and-yeghegis/. live.
14. Web site: 1968-1980 Construction of Tunnel No.2 and of Arpa-Sevan Conduit | Arpa Sevan. 21 January 2022. 28 March 2022. https://web.archive.org/web/20220328104243/http://arpa-sevan.am/en/1968-1980-construction-of-tunnel-no-2-and-of-arpa-sevan-conduit/. live.
15. Web site: This Week In Armenian History: Inauguration of the Arpa-Sevan Tunnel (March 21, 1981). 21 March 2016. Thisweekinarmenianhistory.blogspot.com. 16 June 2019. 13 April 2019. https://web.archive.org/web/20190413140400/http://thisweekinarmenianhistory.blogspot.com/2016/03/inauguration-of-arpa-sevan-tunnel-march.html. live.
16. Web site: Pahang Selangor Raw Water Tunnel The Robbins Company. Therobbinscompany.com. 2016-05-30. https://web.archive.org/web/20160701124812/http://www.therobbinscompany.com/en/case-study/pahang-selangor-malaysia/. 1 July 2016. dead.
17. Web site: Laman Web Rasmi Kementerian Tenaga, Teknologi Hijau dan Air. Kettha.gov.my. 2016-05-30. https://web.archive.org/web/20180724232231/http://www.kettha.gov.my/portal/index.php?r=kandungan%2Findex&menu1_id=1&menu2_id=92&menu3_id=157. 24 July 2018. dead.
18. News: Downtown Line 3 officially opens; Khaw Boon Wan announces review of fares incurred when switching between stations | the Straits Times. The Straits Times. 20 October 2017. 1 February 2022. 3 July 2019. https://web.archive.org/web/20190703111106/https://www.straitstimes.com/singapore/transport/downtown-line-3-officially-opened-khaw-announces-plans-to-make-transfers-between. live.
19. Web site: Stages | Land Transport Authority . lta.gov.sg . 5 February 2022 . https://web.archive.org/web/20140703122517/http://www.lta.gov.sg/content/ltaweb/en/public-transport/projects/downtown-line/stages.html . 3 July 2014 . dead.
20. Web site: Wahlstrom. Ernest E. 1974. History of Geologic Investigations, Engineering Design, and Construction Methods of the Harold D. Roberts Tunnel, Colorado. 30 October 2020. 24 October 2020. https://web.archive.org/web/20201024151144/https://pubs.usgs.gov/pp/0831a/report.pdf. live.
21. Web site: 莞惠城际最快明年启用 松山湖隧道长38公里_新浪东莞 . Sina Corp . 2016-02-01 . https://web.archive.org/web/20160120170635/http://gd.sina.com.cn/dg/news/2014-06-18/12022957.html . 20 January 2016 . dead .
22. Web site: 世界最长高原铁路隧道——新关角隧道贯通. https://web.archive.org/web/20140419054737/http://news.xinhuanet.com/fortune/2014-04/15/c_1110253248.htm. dead. 19 April 2014. Xinhua News Agency. 1 February 2016.
23. Web site: Breakthrough on the Gerede Water Transmission Tunnel - Tunnels & Tunnelling International. tunnelsonline.info. 5 March 2019 . 1 February 2022. 1 February 2022. https://web.archive.org/web/20220201125045/https://www.tunnelsonline.info/news/gerede-water-tunnel-excavation-finally-over-7020876. live.
24. Web site: Gerede Water Transmission Tunnel. Robbins. 1 February 2022. 1 February 2022. https://web.archive.org/web/20220201194139/https://www.robbinstbm.com/ru/projects/gerede-water-transmission-tunnel/. live.
25. Web site: Milwaukee Deep Tunnels . MMSD.com . 13 August 2020 . 6 June 2021 . 6 June 2021 . https://web.archive.org/web/20210606184313/https://www.mmsd.com/what-we-do/wastewater-treatment/deep-tunnel . live .
26. Web site: EVINOS-MORNOS TUNNEL – GREECE . Selitunnel.com . 2016-02-01 . 13 May 2019 . https://web.archive.org/web/20190513015626/http://www.selitunnel.com/pdf_articoli/9.PDF . live .
27. Web site: Evinos-Mornos Tunnel – Greece Construction of a 30 km Long Hydraulic Tunnel in Less Than Three Years Under the Most Adverse Geological Conditions – Document Summary. new.onemine.org . https://web.archive.org/web/20131213003221/http://new.onemine.org/search/summary.cfm/EvinosMornos-Tunnel--Greece-Construction-of-a-30-Km-Long-Hydraulic-Tunnel-in-Less-Than-Three-Years-Under-the-Most-Adverse-Geological-Conditions?d=4196E212BCD1388ED3A7769E6B77DD7AF1E26CB727E7188DA9D6416E43747A8F37321 . 13 December 2013.
28. Web site: 7–26 . Water System Master Plan . Massachusetts Water Resources Authority . December 2006 . Massachusetts Water Resources Authority . 7 July 2013 . 4 March 2016 . https://web.archive.org/web/20160304185120/http://www.mwra.com/publications/masterplan/2006/water.pdf . live .
29. Web site: Guadarrama Tunnel. Structurae. 1 February 2016. 5 October 2013. https://web.archive.org/web/20131005141750/http://en.structurae.de/structures/data/index.cfm?id=s0007961. live.
30. Web site: 7–25 . Water System Master Plan . Massachusetts Water Resources Authority . December 2006 . Massachusetts Water Resources Authority . 7 July 2013 . 4 March 2016 . https://web.archive.org/web/20160304185120/http://www.mwra.com/publications/masterplan/2006/water.pdf . live .
31. Web site: Awards . tunnelintelligence.com . https://web.archive.org/web/20120208134434/http://www.tunnelintelligence.com/awards-in-detail-50.html . 8 February 2012.
32. Web site: Water from Melamchi finally arrives in Kathmandu. 2021-04-21. kathmandupost.com. English. 2 February 2022. https://web.archive.org/web/20220202002752/https://kathmandupost.com/valley/2021/03/07/water-from-melamchi-finally-arrives-in-kathmandu. live.
33. Web site: The LHC, Facts and figures. CERN. 2008. 2 July 2009. 16 July 2009. https://web.archive.org/web/20090716140645/http://public.web.cern.ch/public/en/LHC/Facts-en.html. live.
34. Web site: Şanlıurfa Sulama Tünelleri ve Tesisleri İnşaatı . Eren İnşaatı . 1 October 2010 . tr . dead . https://web.archive.org/web/20110710195319/http://www.ereninsaatas.com/site/t9.php . 10 July 2011 .
35. Web site: Collapse of headrace tunnel after grand opening. Tunnel Talk. 27 September 2010. February 2010. 20 September 2012. https://web.archive.org/web/20120920061557/http://tunneltalk.com/Gilgel-Gibe-II-Feb10-collapse.php. live.
36. Web site: Ethiopia's Gilgel Gibe II hydropower plant resumes operation. nazret.com. 16 June 2019. 6 October 2017. https://web.archive.org/web/20171006170512/http://nazret.com/blog/index.php/2010/12/27/ethiopia-s-gilgel-gibe-ii-hydropower-plant-resumes-operation. live.
37. Web site: http://kr.news.yahoo.com/service/news/shellview.htm?linkid=441&articleid=20100909182956897l6&newssetid=5 . ko:원주~제천 중앙선 복선전철 2011년 6월 착공 . ko . 2010-09-09 . . 19 October 2010 . 26 May 2024 . https://archive.today/20240526062213/https://www.webcitation.org/6Af1Q53jQ?url=http://kr.news.yahoo.com/service/news/shellview.htm%3Flinkid=441 . dead .
38. Web site: Feasibility study and basic plan of Jungang Line for double track between Wonju and Jecheon . Chunsuk Engineering . 19 October 2010 . https://web.archive.org/web/20110722133253/http://www.cse.co.kr/eng/results/res_D.asp?idx=296 . 22 July 2011 . dead.
39. Web site: Korea unveils new low-carbon bullet train . 4 January 2021 .
40. Web site: Gurgaon Metro set for operationalisation next week. News.webindia123.com. 1 February 2016. 30 November 2019. https://web.archive.org/web/20191130195040/https://news.webindia123.com/news/articles/India/20100829/1576007.html. dead.
41. Web site: GovHK: Harbour Area Treatment Scheme. 25 November 2015. Government of Hong Kong. 1 February 2016. https://web.archive.org/web/20151230221213/http://www.gov.hk/en/residents/environment/water/harbourarea.htm. 30 December 2015. dead.
42. Web site: Snowy! Power of a nation. Powerhousemuseum.com. 1 February 2016. dead. https://web.archive.org/web/20160303204431/http://www.powerhousemuseum.com/hsc/snowy/civil.htm. 3 March 2016.
43. Web site: Archived copy . 2014-03-23 . dead . https://archive.today/20130721112038/http://www.ctg.ha.cn/zjgc/ArticleShow.asp?ArtID=859 . 2013-07-21 .
44. Web site: 瓦日铁路（山西中南部铁路通道）30日建成通车_新华网山东频道 . Xinhua News Agency . 2014-12-30 . 2016-02-01 . dead . https://web.archive.org/web/20160304034657/http://www.sd.xinhuanet.com/xhsksd/2014-12/30/c_1113832740.htm . 2016-03-04 .
45. Web site: Iiyama Tunnel. Structurae. 1 February 2016. 14 May 2012. https://web.archive.org/web/20120514032249/http://en.structurae.de/structures/data/index.cfm?id=s0014094. live.
46. Web site: Korea opens Olympic high-speed line. 22 December 2017. Railjournal.com. 16 June 2019. 16 June 2019. https://web.archive.org/web/20190616105609/https://www.railjournal.com/regions/asia/korea-opens-ktx-high-speed-line-for-pyeongchang-winter-olympics/. live.
47. Web site: 1995-2003 "Complex of Hydraulic Structures for Diversion of the Vorotan River Runoff to the Basin of the Arpa River" | Arpa Sevan . 21 January 2022 . 29 November 2018 . https://web.archive.org/web/20181129173353/http://arpa-sevan.am/en/1995-2003-complex-of-hydraulic-structures-for-diversion-of-the-vorotan-river-runoff-to-the-basin-of-the-arpa-river/ . live .
48. Web site: http://civileng7.tistory.com/1020 . ko:경부고속철도 금정터널 개요 . 2009-07-06 . Civil Engineering . ko . 28 August 2010 . 11 March 2012 . https://web.archive.org/web/20120311181626/http://civileng7.tistory.com/1020 . live .
49. Web site: Olmos Trans-Andean Tunnel . The Robbins Company . 2011-12-20 . 2016-02-01.
50. Web site: ABB starts to make 'The London Connection'. 2004-08-14. ABB Group. a 20 km long three-metre diameter tunnel. 8 February 2009. 5 March 2012. https://web.archive.org/web/20120305050156/http://www.abb.com/cawp/seitp202/9C1D698E86B2F7ED8025700C00539EFB.aspx. live.
51. Web site: £200M London Connection Project is Commissioned. September 2005. National Grid plc. 8 February 2009. This 20 km long tunnel contains one of the longest 400 kV XLPE cable circuits to be installed in Europe.. https://web.archive.org/web/20100217010641/http://www.nationalgrid.com/NR/rdonlyres/DE652156-CC9B-4559-9FA1-40210B4B411C/583/London_Connection_MediaReleasefinal.pdf. 17 February 2010. dead.
52. https://tractebel-engie.com/en/references/mantaro-hydroelectric-complex-modernisation
53. Web site: Follobanen – Bane NOR. 14 October 2020. 25 July 2021. https://web.archive.org/web/20210725193546/https://www.banenor.no/Prosjekter/prosjekter/follobanen/. live.
54. Web site: Kong Harald åpnet Follobanen . 12 December 2022 . 4 July 2023 . 4 October 2023 . https://web.archive.org/web/20231004011247/https://www.tv2.no/nyheter/innenriks/kong-harald-apnet-follobanen/15350032/ . live .
55. Web site: Follobanen – Nordens lengste jernbanetunnel: Samferdselsministeren fyrte av første salve. Samferdselsdepartementet. 20 June 2014. Regjeringen.no. 16 June 2019. 20 December 2016. https://web.archive.org/web/20161220121422/https://www.regjeringen.no/no/aktuelt/Follobanen--Nordens-lengste-jernbanetunnel-Samferdselsministeren-fyrte-av-forste-salve/id764206/. live.
56. Web site: Futang, China . 7 December 2021 . 21 January 2022 . 15 August 2022 . https://web.archive.org/web/20220815155829/https://www.power-technology.com/marketdata/futang-china/ . live .
57. Web site: Chinese, Uzbek leaders hail inauguration of Central Asia's longest railway tunnel – Xinhua | English.news.cn . Xinhua News Agency . 15 January 2022 . https://web.archive.org/web/20160623010459/http://news.xinhuanet.com/english/2016-06/23/c_135458470.htm . 23 June 2016 . dead.
58. Web site: Project Profile for Harbour Area Treatment Scheme (HATS) Stage 2A. Government of Hong Kong. 2016-02-01. 3 January 2016. https://web.archive.org/web/20160103082510/http://www.epd.gov.hk/eia/register/profile/latest/esb129.pdf#Page=6. live.
59. Web site: Shiziping, China . 16 December 2021 . 21 January 2022 . 15 August 2022 . https://web.archive.org/web/20220815151058/https://www.power-technology.com/marketdata/shiziping-china/ . live .
60. Precise leveling of the very long Qinling mountain tunnel. 10.1007/BF02826808. 3. Geo-spatial Information Science. 57–61. 2000. Zhenglu. Zhang. Zhentao. Yang. Shaquan. Xu. Xiangduo. Zhang. 1. 2000GSIS....3...57Z. free.
61. Web site: 2012-06-18. 中铁十八局集团中南部铁路通道太行山隧道建设纪实. dead. https://web.archive.org/web/20160120170640/http://www.cr18g.com/a/gb2312/news/qiye/2012/0618/2799.html. 2016-01-20. 2016-02-01. Cr18g.com.
62. Web site: Urban Rail Transport SA :METRO Line 1. Amel.gr. 1 February 2016. 19 May 2012. https://web.archive.org/web/20120519043846/http://www.amel.gr/index.php?id=22&L=1. live.
63. http://bankwatch.org/sites/default/files/briefing-ShuakheviHPP-Georgia-2May2014.pdf The Shuakhevi hydropower plant project, Georgia
64. Web site: Bağbaşı Barajı ve Mavi Tünel'i İnşaatı – Konya . Mavitunel.com . 2016-02-01 . dead . https://web.archive.org/web/20160129085315/http://www.mavitunel.com/ . 29 January 2016 .
65. Web site: New Tunneling Technology in Japan / Statistical Data. Japan-tunnel.org. 1 February 2016. https://web.archive.org/web/20160115174556/http://www.japan-tunnel.org/nttj/statistical_data/index2.html. 15 January 2016. dead.
66. Web site: ko:대우건설 솔안터널 관통식 . http://www.asiaeconomy.co.kr/uhtml/read.php?idxno=2006120711251167615 . ko . Asia Economy . 2006-12-07 . 6 October 2008 . 23 July 2012 . https://web.archive.org/web/20120723032032/http://www.asiae.co.kr/uhtml/read.php?idxno=2006120711251167615 . dead .
67. Web site: Plan view of Kemano T1 and T2 tunnels (Morgenroth, 2016). | Download Scientific Diagram. 28 March 2023. 28 March 2023. https://web.archive.org/web/20230328155153/https://www.researchgate.net/figure/Plan-view-of-Kemano-T1-and-T2-tunnels-Morgenroth-2016_fig1_337086338. live.
68. Web site: Rio Tinto completes Kemano hydropower project . 2023-03-28 . riotinto.com . en . 28 March 2023 . https://web.archive.org/web/20230328155153/https://www.riotinto.com/en/news/releases/2022/rio-tinto-completes-kemano-hydropower-project . live .
69. Web site: Climax Molybdenum – A Freeport-McMoRan Company. climaxmolybdenum.com . https://web.archive.org/web/20140630180945/http://www.climaxmolybdenum.com/WorldwideLocations/USA_Colorado_Henderson.htm . 30 June 2014.
70. Web site: Longest Railroad Tunnels. robl.w1.com . https://web.archive.org/web/20120526160741/http://www.robl.w1.com/Transport/tunnel.htm . 26 May 2012.
71. Web site: Transport Writer. Transportwriter.com. 1 February 2016. 4 March 2016. https://web.archive.org/web/20160304040706/http://www.transportwriter.com/writings/writing4_minetram.htm. dead.
72. Web site: 3-as metróvonal jellemzői. Metros.hu. 27 March 2016. hu. 10 February 2024. https://web.archive.org/web/20240210001223/http://metros.hu/vonal/jellemzok_m3.html. live.
73. Web site: 3-5, 3-9 . Wastewater Master Plan . Massachusetts Water Resources Authority . December 2006 . Massachusetts Water Resources Authority . 7 July 2013 . 8 August 2012 . https://web.archive.org/web/20120808130735/http://www.mwra.com/publications/masterplan/2006/wastewater.pdf . live .
74. http://cdm.unfccc.int/filestorage/z/4/R0BX9WPCSNKHQVUTI37E24A8YOZM16.pdf/Sichuan%20Xuecheng%20Hydropower%20Project%28clear%20version%29%20.pdf?t=Mnh8bnQ1N2NofDDMMDpZU98Wvug0iq9fFgy2
75. Web site: Р"идроспецпроекС'/Dangarinsky Hydrotechnical tunnel in Tajikistan . Gidrospetsproekt.ru . 2016-02-01 . 1 July 2015 . https://web.archive.org/web/20150701170627/http://www.gidrospetsproekt.ru/en/geografiya-obektov/image-map_rossija/tadzhikistan/dangarinskij-gidrotexnicheskij-tonnel.html . live .
76. Web site: RailPictures.Net Photo: SPCC 41 Southern Peru Copper Corporation GE U23B at Toquepala, Peru by Jean-Marc Frybourg. Railpictures.net. 1 February 2016. 8 October 2018. https://web.archive.org/web/20181008174916/http://www.railpictures.net/photo/343052/. live.
77. Web site: 山西中南部铁路通道发鸠山隧道贯通 . 中国网 . 2013-09-19 . 李连明 谢崇志 王瑞晨 . 26 December 2022 . 10 May 2019 . https://web.archive.org/web/20190510151447/http://finance.china.com.cn/roll/20130919/1824721.shtml . live .
78. Web site: Yeni Zigana Tüneli İnşaatı Devam Ediyor. Haberler.com. 17 August 2016. 16 June 2019. 16 June 2019. https://web.archive.org/web/20190616105616/https://www.haberler.com/yeni-zigana-tuneli-insaati-devam-ediyor-8707292-haberi/. live.
79. Web site: Cumhurbaşkanı Erdoğan'dan 'Teşekkürler Rize' paylaşımı . 3 May 2023 . 4 July 2023 . 3 May 2023 . https://web.archive.org/web/20230503170740/https://www.trthaber.com/haber/gundem/yeni-zigana-tuneli-acildi-764621.html . live .
80. News: Başbakan Ovit Dağı Tüneli'nin temelini attı . . Kaçar, Muhammet . 2012-05-13 . tr . 13 May 2012 . 16 May 2012 . https://web.archive.org/web/20120516020002/http://www.hurriyet.com.tr/gundem/20546715.asp . live .
81. Web site: 2010 – Activity Report – ITA-AITES. Ita-aites.org. 1 February 2016. dead. https://web.archive.org/web/20080619151552/http://www.ita-aites.org/cms/564.html. 19 June 2008.
82. Web site: M8 Bostancı-Dudullu Metro Hattı'nın açılışı yapıldı (Yeni metro hattının durakları ve güzergahı) . 4 July 2023 . 21 January 2023 . https://web.archive.org/web/20230121052630/https://www.ntv.com.tr/turkiye/bostanci-dudullu-metrosu-ne-zaman-acilacak-iste-bostanci-dudullu-metro-duraklari-guzergahlari,89GrvJ0-ZkuW7uHj6nUgWg . live .
83. Web site: Гидроузел на р. Ардон. Lhp.rushydro.ru. 1 February 2016. 14 August 2012. https://web.archive.org/web/20120814135012/http://www.lhp.rushydro.ru/company/objectsmap/5730.html. dead.
84. Web site: Общие сведения. Zaramag.rushydro.ru. 1 February 2016. 20 May 2013. https://web.archive.org/web/20130520063847/http://www.zaramag.rushydro.ru/hpp/general. dead.
85. Web site: Зарамагский тоннель – Блог РусГидро. Blog.rushydro.ru. 16 June 2019. 15 February 2016. https://web.archive.org/web/20160215174147/http://blog.rushydro.ru/?p=10068. dead.
86. Web site: Britannica Online Encyclopedia. Encyclopædia Britannica . https://web.archive.org/web/20080225190827/http://www.britannica.com/eb/table?tocId=9438409&idxStructId=105759&typeId= . 25 February 2008.
87. Web site: Measurement of compressive and tensile strain in the railway structures with FBG sensor packages . lib.semi.ac.cn:8080 . https://web.archive.org/web/20120302104804/http://lib.semi.ac.cn:8080/tsh/dzzy/wsqk/spie/vol7292/72923g.pdf . 2 March 2012.
88. Web site: http://www.ita-aites.org/cms/fileadmin/filemounts/general/pdf/ItaAssociation/ProductAndPublication/OpenSession/OS_2006_4SKE-C.pdf . ita-aites.org . https://web.archive.org/web/20090109051907/http://www.ita-aites.org/cms/fileadmin/filemounts/general/pdf/ItaAssociation/ProductAndPublication/OpenSession/OS_2006_4SKE-C.pdf . 9 January 2009.
89. Web site: BBT SE. bbt-se.com . https://web.archive.org/web/20110910043534/http://www.bbt-se.com/index.php?option=com_content&task=view&id=124&Itemid=140&lang=en . 10 September 2011.
90. News: Construction of a long highway tunnel on a snow-covered plateau . i (newspaper) . .
91. Web site: 2021-12-18. Chinese engineers digging giant desert tunnel never saw this coming. 2021-12-21. South China Morning Post. en. 21 December 2021. https://web.archive.org/web/20211221123626/https://www.scmp.com/news/china/science/article/3160185/chinese-engineers-digging-worlds-longest-tunnel-xinjiang-desert. live.
92. Web site: NYC's Giant Water Tunnel Begins Work on Final Shafts, Following 50 Years of Construction . 22 April 2021 . 22 January 2022 . 22 January 2022 . https://web.archive.org/web/20220122003757/https://gothamist.com/news/nycs-giant-water-tunnel-begins-work-on-final-shafts-following-50-years-of-construction . live .
93. Web site: France / Italie. Lyon-Turin : Les marchés du tunnel de base attribués . 22 January 2022 . 9 March 2022 . https://web.archive.org/web/20220309050245/https://www.ledauphine.com/economie/2021/07/07/les-marches-du-tunnel-de-base-du-lyon-turin-attribues . live .
94. Web site: TELT Lyon Turin • Chronology of works . 17 October 2020 . 17 October 2020 . https://web.archive.org/web/20201017095155/https://www.telt-sas.com/en/chronology-of-works/ . live .
95. Web site: Inbetriebnahme des Brennerbasistunnels voraussichtlich erst 2032 . 21 May 2021 . 25 July 2023 . 6 April 2023 . https://web.archive.org/web/20230406214712/https://kurier.at/wirtschaft/inbetriebnahme-des-brennerbasistunnels-voraussichtlich-erst-2032/401388909 . live .
96. Web site: Did you know … . BBT-SE.com . 2016-02-01 . dead . https://web.archive.org/web/20160202005914/http://www.bbt-se.com/en/did-you-know/ . 2 February 2016 .
97. Web site: BBT: Start of Works on the main Tunnel – tunnel . 7 December 2019 . 31 October 2020 . https://web.archive.org/web/20201031081602/https://www.tunnel-online.info/en/artikel/tunnel_Start_of_works_on_the_main_tunnel_2323530.html . live .
98. Web site: 川藏铁路雅安至林芝段建设获批，总投资3198亿元共26站_财经上下游_澎湃新闻-The Paper . 2023-11-17 . thepaper.cn . 20 February 2021 . https://web.archive.org/web/20210220014619/https://www.thepaper.cn/newsDetail_forward_9417519 . live .
99. Web site: 孙汝. Sichuan-Tibet Railway 'extremely challenging' project, expert says. 2021-10-16. China Daily. 16 October 2021. https://web.archive.org/web/20211016225236/https://www.chinadaily.com.cn/a/202103/10/WS604806fea31024ad0baae0eb.html. live.
100. Web site: ΚΑΤΑΣΚΕΥΗ ΤΗΣ ΝΕΑΣ ΓΡΑΜΜΗΣ 4 ΤΟΥ ΜΕΤΡΟ ΤΗΣ ΑΘΗΝΑΣ ΤΜΗΜΑ Α' «ΑΛΣΟΣ ΒΕΪΚΟΥ – ΓΟΥΔΗ» ΔΙΑΔΙΚΑΣΙΑ ΔΟΜΟΣΤΑΤΙΚΗΣ ΚΑΤΑΓΡΑΦΗΣ ΤΩΝ ΚΤΗΡΙΩΝ - ΚΑΤΑΣΚΕΥΩΝ ΣΤΗ ΖΩΝΗ ΕΠΙΡΡΟΗΣ ΤΟΥ ΕΡΓΟY. May 5, 2023. https://web.archive.org/web/20220921225632/https://www.ametro.gr/wp-content/uploads/2022/05/%CE%91%CE%A5%CE%A4%CE%9F%CE%A8%CE%99%CE%91.pdf . 21 September 2022 .
101. Web site: 2021-06-22 . Μετρό-Γραμμή 4: Ξεκινούν τα έργα - Οι 15 σταθμοί από Γαλάτσι έως Γουδί - Έτοιμο σε 8 χρόνια . 2022-05-20 . naftemporiki.gr . el . 20 May 2022 . https://web.archive.org/web/20220520184944/https://www.naftemporiki.gr/finance/story/1740845/metro-grammi-4-ksekinoun-ta-erga-oi-15-neoi-stathmoi-apo-galatsi-eos-goudi-etoimo-se-8-xronia . live .
102. Fu . Helin . Li . Jie . Li . Guoliang . Chen . Jingjun . An . Pengtao . 2023-06-01 . Determination of In Situ Stress by Inversion in a Superlong Tunnel Site Based on the Variation Law of Stress — A Case Study . KSCE Journal of Civil Engineering . en . 27 . 6 . 2637–2653 . 10.1007/s12205-023-0415-3 . 258273345 . 1976-3808 . 17 November 2023 . 22 February 2024 . https://web.archive.org/web/20240222151136/https://link.springer.com/article/10.1007/s12205-023-0415-3 . live .
103. Web site: Construction of the Ya'an-Nyingchi section of the Sichuan-Tibet Railway started--Seetao. Facebook. 27 August 2023. 22 February 2024. https://web.archive.org/web/20240222151118/https://www.seetao.com/details/46798.html. live.
104. Web site: North York Moors potash mine gets £1.7bn go-ahead. The Guardian. 30 June 2015. 2016-02-01. 15 March 2017. https://web.archive.org/web/20170315001843/https://www.theguardian.com/environment/2015/jun/30/north-york-moors-potash-mine-gets-17bn-go-ahead. live.
105. Web site: Kajastie . Nia . 2022-12-13 . Woodsmith tunnel and shafts making 'great progress' following reconfiguration . 2023-10-24 . Ground Engineering (GE) . en . 30 October 2023 . https://web.archive.org/web/20231030160348/https://www.geplus.co.uk/news/woodsmith-tunnel-and-shafts-making-great-progress-following-reconfiguration-13-12-2022/ . live .
106. Web site: Balfour and McAlpine chase £1.7bn York Potash job. Constructionenquirer.com. 2016-02-01. 23 September 2015. https://web.archive.org/web/20150923210508/http://www.constructionenquirer.com/2015/07/07/balfour-and-mcalpine-chase-1-7bn-york-potash-job/. live.
107. Web site: York Potash: Construction 'could start this year' and what else you need to know. Gazettelive.co.uk. July 2015. 2016-02-01. 24 September 2015. https://web.archive.org/web/20150924021846/http://www.gazettelive.co.uk/business/york-potash-construction-could-start-9564014. live.
108. News: Whipple . Tom . Colossal bore gets priest's blessing to dig a giant tunnel at Yorkshire Mine . The Times . 72820 . 13 April 2019 . 22. 0140-0460.
109. Web site: Gaoligongshan Tunnel on Dali-Ruili Railway, The Longest Mountain Railway Tunnel in Asia . live . https://web.archive.org/web/20230725013759/https://awards.ita-aites.org/images/CTUC_conference/Gaoligongshan.pdf . 25 July 2023.
110. Web site: 我国铁路第一长隧高黎贡山隧道进入全面施工阶段 . Gaoligongshan, the longest Tunnel of China, entering the comprehensive construction phase . 2017-08-28 . Gov.cn . . 2017-09-03 . 3 September 2017 . https://web.archive.org/web/20170903213057/http://www.gov.cn/xinwen/2017-08/28/content_5221068.htm#1 . live .
111. Web site: Eröffnung der Koralmbahn verzögert sich bis 2026. 2018-03-23. 14 October 2020. 10 April 2019. https://web.archive.org/web/20190410051414/https://steiermark.orf.at/news/stories/2902798/. live.
112. Web site: ÖBB-Infrastruktur AG. oebb.at . https://web.archive.org/web/20121130092401/http://www.oebb.at/infrastruktur/de/5_0_fuer_Generationen/5_4_Wir_bauen_fuer_Generationen/5_4_1_Schieneninfrastruktur/Pontebbanaachse_Suedbahn/Koralmbahn/Wettmannstaetten__St._Andrae/index.jsp . 30 November 2012.
113. Web site: First phase of Cross Island MRT line finalised; will have 12 stations. 2019-01-25. The Straits Times. en. 2019-06-12. 25 January 2019. https://web.archive.org/web/20190125130935/https://www.straitstimes.com/singapore/transport/first-phase-of-cross-island-mrt-line-finalised-will-have-12-stations. live.
114. Web site: LTA | Construction Commences on the Cross Island Line . 25 July 2023 . 19 January 2023 . https://web.archive.org/web/20230119015146/https://www.lta.gov.sg/content/ltagov/en/newsroom/2023/1/news-releases/construction_commences_on_CRL.html . live .
115. Web site: About NCPCP . 1 November 2021 . Mahaweli Water Security Investment Program . 11 November 2021. live . https://web.archive.org/web/20211119052913/http://www.mwsip.lk/index.php?option=com_content&view=article&id=5&Itemid=127&lang=en . 19 November 2021 .
116. Web site: Valico Tunnel (Alessandria/Genova, 2021) . 25 July 2023 . 25 July 2023 . https://web.archive.org/web/20230725013030/https://structurae.net/en/structures/valico-tunnel-2021 . live .
117. Web site: Genoa-Milan high-speed railway marks double tunnel breakthrough . 28 September 2020 . 25 July 2023 . 25 July 2023 . https://web.archive.org/web/20230725013023/https://www.geplus.co.uk/news/genoa-milan-high-speed-railway-reaches-double-tunnel-breakthrough-28-09-2020/ . live .
118. Web site: Geologische Störzone führt zu späterer Fertigstellung des Semmering-Basistunnels . 25 July 2023 . 28 January 2023 . https://web.archive.org/web/20230128214455/https://presse-oebb.at/News_Detail.aspx?id=155207 . live .
119. Web site: ÖBB Infrastruktur AG: 2014_01_10_Semmering-Basistunnel neu – Baustart des ersten Tunnelbauloses . oebb.at . 2 February 2022 . https://web.archive.org/web/20140223015317/http://www.oebb.at/infrastruktur/de/Presse/Presseinformationen/2014_01_10_Semmering-Basistunnel_neu_-_Baustart_des_ersten_Tunnelbauloses/index.jsp . 23 February 2014 . dead.
120. Web site: (+) Slik skal Rogfast ferdigstilles til planlagt tid . 18 March 2022 . 19 February 2024 . 23 September 2023 . https://web.archive.org/web/20230923231513/https://www.bygg.no/slik-skal-rogfast-ferdigstilles-til-planlagt-tid/1493596!/ . live .
121. News: Regjeringen klar for å gå videre med Rogfast . no . The Government is Ready to Move Forward with Rogfast . Syed Ali Shahbaz . Akhtar . Cathrine . Oftedahl . Gunnar . Morsund . . 2020-11-20 . 2020-12-27 . 24 August 2021 . https://web.archive.org/web/20210824065731/https://www.nrk.no/rogaland/regjeringen-klar-for-a-ga-videre-med-rogfast-1.15253186 . live .
122. Web site: SRL East. Victoria's Big Build. 11 May 2022. 15 May 2022. 27 February 2023. https://web.archive.org/web/20230227045421/https://bigbuild.vic.gov.au/projects/suburban-rail-loop/srl-east. live.
123. Web site: Works Start Today on Victoria's Suburban Rail Loop Premier of Victoria . 2022-06-02 . premier.vic.gov.au . en . 1 June 2022 . https://web.archive.org/web/20220601230218/https://www.premier.vic.gov.au/works-start-today-victorias-suburban-rail-loop . live .
124. Web site: 5 Year Project to Bring More Water To Chiang Mai Through New Water Tunnels . Chiangmaicitylife.com . CityNews . 2016-06-30 . en . 12 July 2012 . 3 October 2016 . https://web.archive.org/web/20161003220656/http://www.chiangmaicitylife.com/news/5-year-project-to-bring-more-water-to-chiang-mai-through-new-water-tunnels/ . live .
125. Web site: Protests greet PM in Chiang Mai, over 2,000 police provide protection . 2023-10-24 . thaipbsworld.com . en-US . 30 October 2023 . https://web.archive.org/web/20231030155526/https://www.thaipbsworld.com/protests-greet-pm-in-chiang-mai-over-2000-police-provide-protection/ . live .
126. News: Duterte, Abe may sign Mega Manila subway deal in November . Rappler . 19 April 2017 . 18 April 2017 . Ranada, Pia . 19 April 2017 . https://web.archive.org/web/20170419082004/http://www.rappler.com/nation/167250-duterte-abe-mega-manila-subway-deal . live .
127. News: Mercurio. Richmond. 19 April 2022. Metro Manila subway partial opening moved to 2025 – DOTr. The Philippine Star. Manila. 19 April 2022. 19 April 2022. https://web.archive.org/web/20220419072030/https://www.philstar.com/nation/2022/04/19/2175154/metro-manila-subway-partial-opening-moved-2025-dotr. live.
128. Web site: Tianshan Shengli tunnel under construction in Xinjiang – China News – SINA English . 22 January 2022 . 22 January 2022 . https://web.archive.org/web/20220122004945/http://english.sina.com/china/s/2021-02-08/detail-ikftssap4713769.shtml . live .
129. Web site: NHSRCL opens tender for 21-km tunnel between BKC and Thane . 10 February 2023 . 19 February 2024 . 19 February 2024 . https://web.archive.org/web/20240219002137/https://www.hindustantimes.com/cities/mumbai-news/nhsrcl-opens-tender-for-21-km-tunnel-between-bkc-and-thane-101675970767650.html . live .
130. Web site: Mumbai-Ahmedabad Bullet Train: Afcons Begins Piling Work for Shaft-2 . 12 November 2023 . 19 February 2024 . 19 February 2024 . https://web.archive.org/web/20240219002142/https://themetrorailguy.com/2023/11/12/mumbai-ahmedabad-bullet-train-afcons-begins-piling-work-for-shaft-2/ . live .
131. Web site: Herrenknecht to Supply Mumbai-Ahmedabad Bullet Train's Tunnel Boring Machines . 18 July 2023 . 19 February 2024 . 19 February 2024 . https://web.archive.org/web/20240219002136/https://themetrorailguy.com/2023/07/18/herrenknecht-to-supply-mumbai-ahmedabad-bullet-trains-tunnel-boring-machines/ . live .
132. Web site: Herrenknecht to Supply Mumbai-Ahmedabad Bullet Train's Tunnel Boring Machines . 18 July 2023 . 19 February 2024 . 19 February 2024 . https://web.archive.org/web/20240219002136/https://themetrorailguy.com/2023/07/18/herrenknecht-to-supply-mumbai-ahmedabad-bullet-trains-tunnel-boring-machines/ . live .
133. Web site: NHSRCL Signs Contract for the Construction of 21 km Long Tunnel including India's First 7 Km long Undersea Rail Tunnel | NHSRCL . 19 February 2024 . 19 February 2024 . https://web.archive.org/web/20240219005654/https://www.nhsrcl.in/en/media/press-release/nhsrcl-signs-contract-construction-21-km-long-tunnel-including-indias-first-7 . live .
134. Web site: Maria . Roberto Di . 2022-02-07 . RADDOPPIO PALERMO-CATANIA, PRONTO IL PROGETTO FIUMETORTO-LERCARA - Siciliainprogress . 2022-04-11 . it-IT.
135. Web site: PA-CT L1+2 | TunnelPro .
136. Web site: Webuild JV snags another £1bn Sicily high speed rail construction deal . 8 June 2023 .
137. Web site: Terowong Genting ECRL terpanjang di Asia Tenggara . 13 January 2022 . 9 April 2022 . 13 January 2022 . https://web.archive.org/web/20220113225817/https://www.utusan.com.my/berita/2022/01/terowong-genting-ecrl-terpanjang-di-asia-tenggara/ . live .
138. Web site: Milliarden unters Meer. Der Spiegel. 2020-05-26. 21 January 2022. 22 September 2020. https://web.archive.org/web/20200922170621/https://www.spiegel.de/wirtschaft/unternehmen/fehmarn-belt-tunnel-streit-ueber-ostsee-querung-nach-daenemark-kommt-vor-gericht-a-bda38feb-12bb-4cd5-a426-fa6c241bd350. live.
139. Web site: Nu starter anlægsarbejdet på Femern Bælt-forbindelsen . 1 January 2021 . 26 June 2021 . 23 February 2022 . https://web.archive.org/web/20220223010515/https://www.trm.dk/nyheder/2021/nu-starter-anlaegsarbejdet-paa-femern-baelt-forbindelsen . live .
140. Web site: E4 Förbifart Stockholm – Trafikverket . Trafikverket.se . 2015-09-25 . 2016-02-01 . 21 March 2015 . https://web.archive.org/web/20150321024640/http://www.trafikverket.se/forbifartstockholm . live .
141. Web site: Förlängd byggtid och ökad kostnad för Förbifart Stockholm . 28 November 2019 . 1 February 2022 . 1 February 2022 . https://web.archive.org/web/20220201234913/https://byggteknikforlaget.se/forlangd-byggtid-och-okad-kostnad-for-forbifart-stockholm/ . live .
142. Web site: Undersea rail tunnel plan complete – People's Daily Online . 22 January 2022 . 22 January 2022 . https://web.archive.org/web/20220122004954/http://en.people.cn/n3/2020/0803/c90000-9717580.html . live .
143. Web site: 世界级跨海工程甬舟铁路开工建设-岩土在线 . 22 January 2022 . 22 January 2022 . https://web.archive.org/web/20220122004956/https://news.yantuchina.com/46752.html . live .
144. Web site: HS2 Phase One full business case . 2023-10-24 . GOV.UK . en . 19 April 2020 . https://web.archive.org/web/20200419044453/https://www.gov.uk/government/publications/hs2-phase-one-full-business-case . live .
145. Web site: Chiltern Tunnel. 2022-02-04. High Speed 2. en-GB. 4 February 2022. https://web.archive.org/web/20220204093420/https://www.hs2.org.uk/building-hs2/tunnels/tunnel-drives/chiltern-tunnel/. live.
146. Web site: 2021-05-13. Work begins boring first HS2 tunnel under Chiltern Hills. 2021-05-21. The Guardian. en. 19 May 2021. https://web.archive.org/web/20210519201600/https://www.theguardian.com/uk-news/2021/may/13/work-begins-under-chiltern-hills-boring-first-hs2-tunnel. live.
147. Web site: The HS2 Tunnel Boring Machines (TBMs). 2021-05-21. High Speed 2. en-GB. 21 May 2021. https://web.archive.org/web/20210521124313/https://www.hs2.org.uk/building-hs2/tunnels/the-hs2-tunnel-boring-machines/. live.
148. News: 2022-08-30 . To be built at Rs 23,000 crore, Uttarakhand to get India's 'longest railway tunnel' . The Times of India . 2023-05-02 . 0971-8257 . 3 May 2023 . https://web.archive.org/web/20230503000637/https://timesofindia.indiatimes.com/city/dehradun/to-be-built-at-rs-23000-crore-uttarakhand-to-get-indias-longest-railway-tunnel/articleshow/93866506.cms . live .
149. Web site: PM Modi inaugurates Zojila project in Leh: All you need to know about India's longest tunnel. 19 May 2018. The Indian Express. 16 June 2019. 15 December 2019. https://web.archive.org/web/20191215182759/https://indianexpress.com/article/india/j-k-pm-modi-inaugurates-zojila-tunnel-project-in-leh-all-you-need-to-know-about-indias-longest-tunnel-5182934/. live.
150. Web site: Gadkari to initiate first blasting of all-weather Zojila Tunnel between Srinagar and Leh . 15 October 2020 . 21 January 2022 . 21 January 2022 . https://web.archive.org/web/20220121175906/https://www.hindustantimes.com/india-news/gadkari-to-initiate-first-blasting-of-all-weather-zojila-tunnel-between-srinagar-and-leh/story-M1IzoZ93isMJjqgRP8C4YO.html . live .
151. Web site: Start for new Metro Line and Extension Projects in Bangkok; The Robbins Company . Tunnel-online.info . 20 February 2017 . 12 July 2017 . 6 August 2017 . https://web.archive.org/web/20170806085614/http://www.tunnel-online.info/en/artikel/tunnel_Start_for_new_Metro_Line_and_Extension_Projects_in_Bangkok_2798278.html . live .
152. Web site: HS2 starts digging 26 miles of tunnel under London . 6 October 2022 . 4 July 2023 . 9 October 2022 . https://web.archive.org/web/20221009214521/https://www.ianvisits.co.uk/articles/hs2-starts-digging-26-miles-of-tunnel-under-london-57926/ . live .
153. Web site: Haberler | Buca Metrosu'nun yapımı sürüyor. ÜNİBEL. A.Ş. İzmir Büyükşehir Belediyesi. 27 August 2023. 27 August 2023. https://web.archive.org/web/20230827104632/https://www.izmir.bel.tr/tr/Haberler/buca-metrosu-nun-yapimi-suruyor/47126/156. live.
154. Web site: 2017-10-31. China preparing world's longest tunnel to divert Tibet river to desert. 2021-11-18. Global Construction Review. en-GB. 18 November 2021. https://web.archive.org/web/20211118105654/https://www.globalconstructionreview.com/china-preparing-worlds-longest-tunnel-divert-tibet/. live.
155. Web site: Túnel de 30 km deve abrigar trem que vai ligar São Paulo a Santos . 9 December 2013 . 25 July 2023 . 25 July 2023 . https://web.archive.org/web/20230725022622/https://viatrolebus.com.br/2013/12/trem-que-vai-ligar-sao-paulo-a-santos-correra-por-nova-ferrovia/ . live .
156. Web site: Do You Know, That? – Railway Tunnels. En.infoglobe.cz. 1 February 2016. 24 October 2021. https://web.archive.org/web/20211024124634/https://en.infoglobe.cz/topics-of-interest/do-you-know-that-railway-tunnels/. live.
157. Web site: Grimseltunnel - Projekt. grimseltunnel.ch. 17 October 2020. 17 October 2020. https://web.archive.org/web/20201017070043/https://www.grimseltunnel.ch/projekt/. live.
158. Web site: ICT Bids for DPR of Assam's Tunnel Project Under Brahmaputra . 12 July 2023 . 19 February 2024 . 19 February 2024 . https://web.archive.org/web/20240219013854/https://themetrorailguy.com/2023/07/12/ict-bids-for-dpr-of-assams-tunnel-project-under-brahmaputra/ . live .
159. News: The design of lot 3 of Struma motorway is completed. stroitelstvo.info. 2013-11-18. bg. dead. https://web.archive.org/web/20131125203754/http://stroitelstvo.info/show.php?storyid=2184583. 25 November 2013.