Heligoland Explained

German Name:German: Helgoland
Image Plan:Helgoland in PI.svg
Image Coa:DEU Helgoland COA.svg
Coordinates:54.1825°N 7.8853°W
State:Schleswig-Holstein
District:Pinneberg
Elevation:61
Area:1.7
Postal Code:27498
Area Code:04725
Licence:PI, AG
Gemeindeschlüssel:01 0 56 025
Mayor:Thorsten Pollmann
Party:independent

Heligoland (; German: Helgoland, pronounced as /de/; Heligolandic Frisian: Northern Frisian: deät Lun,, Mooring Frisian: Northern Frisian: Hålilönj, Danish: Helgoland) is a small archipelago in the North Sea.[1] A part of the German state of Schleswig-Holstein since 1890, the islands were historically possessions of Denmark, then became the possessions of the United Kingdom from 1807 to 1890, and briefly managed as a war prize from 1945 to 1952.

The islands are located in the Heligoland Bight (part of the German Bight) in the southeastern corner of the North Sea and had a population of 1,127 at the end of 2016. They are the only German islands not in the vicinity of the mainland. They lie approximately 69km (43miles) by sea from Cuxhaven at the mouth of the River Elbe. During a visit to the islands, August Heinrich Hoffmann von Fallersleben wrote the lyrics to "German: [[Deutschlandlied]]", which became the national anthem of Germany.

In addition to German, the local population, who are ethnic Frisians, speak the Heligolandic dialect of the North Frisian language called .

Name

The island had no distinct name before the 19th century. It was often referred to by variants of the High German Heiligland ('holy land') and once even as the island of the Holy Virgin Ursula. Theodor Siebs summarized the critical discussion of the name in the 19th century in 1909 with the thesis that, based on the Frisian self-designation of the Heligolanders as Halunder, the island name meant 'high land' (similar to Hallig).[2] In the following discussion by Jürgen Spanuth, Wolfgang Laur again proposed the original name of Heiligland.[3] The variant Helgoland, which has appeared since the 16th century, is said to have been created by scholars who Latinized a North Frisian form Helgeland, using it to refer to a legendary hero, Helgi.[4] [5] The discussion is complicated by a disagreement as to which of the listed names really refers to the island of Helgoland, and by a desire for the island still to be seen as holy today.[6]

Geography

Heligoland is located 46km (29miles) off the German coastline and consists of two islands: the populated triangular 1abbr=onNaNabbr=on main island to the west, and the ('dune', Heligolandic: Northern Frisian: de Halem) to the east. Heligoland generally refers to the former island. German: Düne|italic=no is somewhat smaller at, lower, and surrounded by sand beaches. It is not permanently inhabited, but is today the location of Heligoland's airfield.

The main island is commonly divided into the ('Lower Land', Heligolandic: Northern Frisian: deät Deelerlun) at sea level (to the right on the photograph, where the harbour is located), the ('Upper Land', Heligolandic: Northern Frisian: deät Boperlun) consisting of the plateau visible in the photographs, and the ('Middle Land') between them on one side of the island. The came into being in 1947 as a result of explosions detonated by the British Royal Navy (the so-called "Big Bang"; see below).

The main island also features small beaches in the north and the south and drops to the sea 50m (160feet) high in the north, west and southwest. In the latter, the ground continues to drop underwater to a depth of 56m (184feet) below sea level. Heligoland's most famous landmark is the ('Long Anna' or 'Tall Anna'), a free-standing rock column (or stack), 47m (154feet) high, found northwest of the island proper.

The two islands were connected until 1720 when the natural connection was destroyed by a storm flood. The highest point is on the main island, reaching 61m (200feet) above sea level.

Although culturally and geographically closer to North Frisia in the German district of, the two islands are part of the district of Pinneberg in the state of Schleswig-Holstein. The main island has a good harbour and is frequented mostly by sailing yachts.

History

The German Bight and the area around the island are known to have been inhabited since prehistoric times. Flint tools have been recovered from the bottom of the sea surrounding Heligoland. On the Oberland, prehistoric burial mounds were visible until the late 19th century, and excavations showed skeletons and artefacts. Moreover, prehistoric copper plates have been found under water near the island; those plates were almost certainly made on the Oberland.[7]

In 697, Radbod, the last Frisian king, retreated to the then-single island after his defeat by the Franks – or so it is written in the Life of Willebrord by Alcuin. By 1231, the island was listed as the property of the Danish king Valdemar II. Archaeological findings from the 12th to 14th centuries suggest that copper ore was processed on the island.[8]

There is a general understanding that the name "Heligoland" means "Holy Land" (compare modern Dutch and German heilig, "holy").[9] In the course of the centuries several alternative theories have been proposed to explain the name, from a Danish king Heligo to a Frisian word, hallig, meaning "salt marsh island". The 1911 Encyclopædia Britannica suggests Hallaglun, or Halligland, i.e. "land of banks, which cover and uncover".[10]

Traditional economic activities included fishing, hunting birds and seals, wrecking and – very important for many overseas powers – piloting overseas ships into the harbours of Hanseatic League cities such as Bremen and Hamburg. In some periods Heligoland was an excellent base point for huge herring catches. Until 1714 ownership switched several times between Denmark–Norway and the Duchy of Schleswig, with one period of control by Hamburg. In August 1714, it was conquered by Denmark–Norway, and it remained Danish until 1807.[11]

19th century

On 11 September 1807, during the Napoleonic Wars, brought to the Admiralty the despatches from Admiral Thomas Macnamara Russell announcing Heligoland's capitulation to the British. Heligoland became a centre of resistance and intrigue against Napoleon. Denmark then ceded Heligoland to George III of the United Kingdom by the Treaty of Kiel (14 January 1814). Thousands of Germans came to Britain and joined the King's German Legion via Heligoland.

The British annexation of Heligoland was ratified by the Treaty of Paris signed on 30 May 1814, as part of a number of territorial reallocations following the abdication of Napoleon as Emperor of the French.

The prime reason at the time for Britain's retention of a small and seemingly worthless acquisition was to restrict any future French naval aggression against the Scandinavian or German states.[12] In the event, no effort was made during the period of British administration to make use of the islands for military purposes, partly for financial reasons but principally because the Royal Navy considered Heligoland to be too exposed as a forward base.[13]

In 1826, Heligoland became a seaside spa and soon turned into a popular tourist resort for the European upper class. The island attracted artists and writers, especially from Germany and Austria who apparently enjoyed the comparatively liberal atmosphere, including Heinrich Heine and August Heinrich Hoffmann von Fallersleben. More vitally it was a refuge for revolutionaries of the 1830s and the 1848 German revolution.As related in The Leisure Hour, it was "a land where there are no bankers, no lawyers, and no crime; where all gratuities are strictly forbidden, the landladies are all honest and the boatmen take no tips",[14] while The English Illustrated Magazine provided a description in the most glowing terms: "No one should go there who cannot be content with the charms of brilliant light, of ever-changing atmospheric effects, of a land free from the countless discomforts of a large and busy population, and of an air that tastes like draughts of life itself."[15]

Britain ceded the islands to Germany in 1890 in the Heligoland–Zanzibar Treaty. The newly unified Germany was concerned about a foreign power controlling land from which it could command the western entrance to the militarily-important Kiel Canal, then under construction along with other naval installations in the area and thus traded for it. A "grandfathering"/optant approach prevented the inhabitants of the islands from forfeiting advantages because of this imposed change of status.

Heligoland has an important place in the history of the study of ornithology, and especially the understanding of migration. The book Heligoland, an Ornithological Observatory by Heinrich Gätke, published in German in 1890 and in English in 1895, described an astonishing array of migrant birds on the island and was a major influence on future studies of bird migration.[16]

In 1892, the Biological Station of Helgoland was founded by phycologist Paul Kuckuck, a student of Johannes Reinke (leading marine phycologist).[17]

20th century

Under the German Empire, the islands became a major naval base, and during the First World War the civilian population was evacuated to the mainland. The island was fortified with concrete gun emplacements along its cliffs similar to the Rock of Gibraltar. Island defences included 364 mounted guns including 142 42cm (17inches) disappearing guns overlooking shipping channels defended with ten rows of naval mines.[18] The first naval engagement of the war, the Battle of Heligoland Bight, was fought nearby in the first month of the war. The islanders returned in 1918, but during the Nazi era the naval base was reactivated.

Werner Heisenberg (1901–1976) first formulated the equation underlying his theory of quantum mechanics while on Heligoland in the 1920s. While a student of Arnold Sommerfeld at Munich, Heisenberg first met the Danish physicist Niels Bohr in 1922 at the Bohr Festival, Gottingen.[19] He and Bohr went for long hikes in the mountains and discussed the failure of existing theories to account for the new experimental results on the quantum structure of matter. Following these discussions, Heisenberg plunged into several months of intensive theoretical research but met with continual frustration. Finally, suffering from a severe attack of hay fever that his aspirin and cocaine treatment was failing to alleviate,[20] he retreated to the treeless (and pollenless) island of Heligoland in the summer of 1925. There he conceived the basis of the quantum theory.

In 1937, construction began on a major reclamation project (German: [[Project Hummerschere]]) intended to expand existing naval facilities and restore the island to its pre-1629 dimensions, restoring large areas which had been eroded by the sea. The project was largely abandoned after the start of World War II and was never completed.

World War II

The area was the setting of the aerial Battle of the Heligoland Bight in 1939, a result of Royal Air Force bombing raids on Kriegsmarine warships in the area. The waters surrounding the island were frequently mined by Allied aircraft.

Heligoland also had a military function as a sea fortress in the Second World War. Completed and ready for use were the submarine bunker North Sea III, the coastal artillery, an air-raid shelter system with extensive bunker tunnels and the airfield with the air force – German: Jagdstaffel Helgoland (April to October 1943).[21] Forced labour of, among others, citizens of the Soviet Union was used during the construction of military installations during World War II.[22]

On 3 December 1939, Heligoland was directly bombed by the Allies for the first time. The attack, by twenty four Wellington bombers of 38, 115 and 149 squadrons of the Royal Air Force failed to destroy the German warships at anchor.[23]

In three days in 1940, the Royal Navy lost three submarines in Heligoland: on 6 January, on 7 January and on 9 January.[24]

Early in the war, the island was generally unaffected by bombing raids. Through the development of the Luftwaffe, the island had largely lost its strategic importance. The German: [[Jagdgeschwader|Jagdstaffel]] Helgoland, temporarily used for defense against Allied bombing raids, was equipped with a rare variant of the Messerschmitt Bf 109 fighter originally designed for use on aircraft carriers.

Shortly before the war ended in 1945, Georg Braun and Erich Friedrichs succeeded in forming a resistance group. Shortly before they were to execute the plans, however, they were betrayed by two members of the group. About twenty men were arrested on 18 April 1945; fourteen of them were transported to Cuxhaven. After a short trial, five resisters were executed by firing squad at Cuxhaven-Sahlenburg on 21 April 1945 by the German authorities.[25]

To honour them, in April 2010 the Helgoland Museum installed six stumbling blocks on the roads of Heligoland. Their names are Erich P. J. Friedrichs, Georg E. Braun, Karl Fnouka, Kurt A. Pester, Martin O. Wachtel, and Heinrich Prüß.

With two waves of bombing raids on 18 and 19 April 1945, 1,000 Allied aircraft dropped about 7,000 bombs on the islands. The populace took shelter in air raid shelters. The German military suffered heavy casualties during the raids.[26] The bomb attacks rendered the island unsafe, and it was totally evacuated.

Bombing and mining of Heligoland during World War II
width=170pxDate/TargetResult
11 March – 24 August 1944No. 466 Squadron RAAF laid mines.[27]
18 April 1944No. 466 Squadron RAAF conducted bombing operations.
29 August 1944Mission 584: 11 B-17 Flying Fortresses and 34 B-24 Liberators bomb Heligoland Island; 3 B-24s are damaged. Escort is provided by 169 P-38 Lightnings and P-51 Mustangs; 7 P-51s are damaged.[28]
3 September 1944Operation Aphrodite B-17 63954 attempt on U-boat pens[29] failed when US Navy controller flew aircraft into Düne Island by mistake.
11 September 1944Operation Aphrodite B-17 30180 attempt on U-boat pens hit by enemy flak and crashed into sea.
29–30 September 194415 Lancasters conducted minelaying in the Kattegat and off Heligoland. No aircraft lost.
5–6 October 194410 Halifaxes conducted minelaying off Heligoland. No aircraft lost.
15 October 1944Operation Aphrodite B-17 30039 *Liberty Belle* and B-17 37743 attempt on U-boat pens[30] destroyed many of the buildings of the Unterland.
26–27 October 194410 Lancasters of No 1 Group conducted minelaying off Heligoland. 1 Lancaster minelayer lost.[31] and the islands were evacuated the following night.
22–23 November 194417 Lancasters conducted minelaying off Heligoland and in the mouth of the River Elbe without loss.
23 November 19444 Mosquitoes conducted Ranger patrols in the Heligoland area. No aircraft lost.
31 December 1944On Eighth Air Force Mission 772, 1 B-17 bombed Heligoland island.[32]
4–5 February 194515 Lancasters and 12 Halifaxes minelaying off Heligoland and in the River Elbe. No minelaying aircraft lost.
16–17 March 194512 Halifaxes and 12 Lancasters minelaying in the Kattegat and off Heligoland. No aircraft lost.[33]
18 April 1945969 aircraft (617 Lancasters, 332 Halifaxes, 20 Mosquitoes) bombed the Naval base, airfield, and village into crater-pitted moonscapes. 3 Halifaxes were lost. The islands were evacuated the following day.[34]
19 April 194536 Lancasters of 9 and 617 Squadrons attacked coastal battery positions with Tallboy bombs for no losses.

Explosion

From 1945 to 1952 the uninhabited islands fell within the British Occupation zone. On 18 April 1947, the Royal Navy simultaneously detonated 6,700 tonnes of explosives ("Operation Big Bang" or "British Bang"), successfully destroying the island's principal military installations (namely, the submarine pens, the coastal batteries at the north and south ends of the island and 8½ miles of main storage tunnels) while leaving the town, already damaged by Allied bombing during the Second World War, "looking little worse" (according to an observer quoted in the Guardian newspaper).[35] The destruction of the submarine pens resulted in the creation of the Mittelland crater. The British later used the island, from which the population had been evacuated, as a bombing range. The explosion was one of the biggest single non-nuclear detonations in history.[36] [37]

Return of sovereignty to Germany

On 20 December 1950, two students and a professor from Heidelberg – René Leudesdorff, Georg von Hatzfeld and Hubertus zu Löwenstein – occupied the off-limits island and raised various German, European and local flags. The students were arrested by the soldiers present and brought back to Germany. The event started a movement to restore the islands to West Germany, which gained the support of the West German parliament. On 1 March 1952, Heligoland was returned to German control, and the former inhabitants were allowed to return.[38] The first of March is an official holiday on the island. The German authorities cleared a significant quantity of unexploded ordnance and rebuilt the houses before allowing its citizens to resettle there.

21st century

Heligoland, like the small exclave Büsingen am Hochrhein, is now a holiday resort and enjoys a tax-exempt status, being part of Germany and the EU but excluded from the EU VAT area and customs union.[39] [40] Consequently, much of the economy is founded on sales of cigarettes, alcoholic beverages, and perfume to tourists who visit the islands. The ornithological heritage of Heligoland has also been re-established, with the Heligoland Bird Observatory, now managed by the German: Ornithologische Arbeitsgemeinschaft Helgoland e.V. ("Ornithological Society of Heligoland") which was founded in 1991. A search and rescue (SAR) base of the DGzRS, the German: Deutsche Gesellschaft zur Rettung Schiffbrüchiger (German Maritime Search and Rescue Service), is located on Heligoland.

Energy supply

Before the island was connected to the mainland network by a submarine cable in 2009, electricity on Heligoland was generated by a local diesel plant.

Heligoland was the site of a trial of GROWIAN, a large wind-turbine testing project. In 1990, a 1.2 MW turbine of the MAN type WKA 60 was installed. Besides technical problems, the turbine was not lightning-proof and insurance companies would not provide coverage. The wind energy project was viewed as a failure by the islanders and was stopped.[41] [42] The Heligoland Power Cable has a length of 53km (33miles) and is one of the longest AC submarine power cables in the world and the longest of its kind in Germany.[43] It was manufactured by the North German Seacable Works in a single piece and was laid by the barge Nostag 10 in 2009. The cable is designed for an operational voltage of 30 kV, and reaches the German mainland at Sankt Peter-Ording.

Expansion plans and wind industry

Plans to re-enlarge the land bridge between different parts of the island by means of land reclamation came up between 2008 and 2010.[44] However, the local community voted against the project.[45] [46]

Since 2013, a new industrial site is being expanded on the southern harbour. E.ON, RWE and WindMW plan to manage operation and services of large offshore windparks from Heligoland.[47] [48] [49] The range had been cleared of leftover ammunition.[50]

Demographics

At the beginning of 2020, 1,399 people lived on Heligoland.[51] As of 2018, the population is mostly Lutheran (63%), while a minority (18%) is Catholic.[52] [53] There is a multi-sport club on the island, VfL Fosite Helgoland, of which an estimated 500 islanders are members.[54]

Climate

The climate of Heligoland is typical of an offshore climate, being almost free of pollen and thus ideal for people with pollen allergies. Since there is no land mass in the vicinity, temperatures rarely drop below 0°C even in the winter. At times, winter temperatures can be higher than in Hamburg by up to because cold air from the east is warmed up over the North Sea. While spring tends to be comparatively cool, autumn on Heligoland is often longer and warmer than on the mainland, and statistically, the climate is generally sunnier. The coldest temperature ever recorded on Heligoland was -11.2°C in February 1956, while the highest was 28.7°C in July 1994.

Owing to the mild climate, figs have reportedly been grown on the island as early as 1911,[55] and a 2005 article mentioned Japanese bananas, figs, agaves, palm trees and other exotic plants that had been planted on Heligoland and were thriving.[56] There still is an old mulberry tree in the Upper Town.

Geology

The island of Heligoland is a geological oddity; the presence of the main island's characteristic red sedimentary rock in the middle of the German Bight is unusual. It is the only such formation of cliffs along the continental coast of the North Sea. The formation itself, called the Bunter sandstone or Buntsandstein, is from the early Triassic geologic age. It is older than the white chalk that underlies the island Düne, the same rock that forms the White Cliffs of Dover in England and cliffs of Danish and German islands in the Baltic Sea. A small chalk rock close to Heligoland, called witt Kliff (white cliff),[57] is known to have existed within sight of the island to the west until the early 18th century, when storm floods finally eroded it to below sea level.

Heligoland's rock is significantly harder than the postglacial sediments and sands forming the islands and coastlines to the east of the island. This is why the core of the island, which a thousand years ago was still surrounded by a large low-lying marshland and sand dunes separated from coast in the east only by narrow channels, has remained to this day, although the onset of the North Sea has long eroded away all of its surroundings. A small piece of Heligoland's sand dunes remains – the sand isle just across the harbour called Düne (Dune). A referendum in June 2011 dismissed a proposal to reconnect the main island to the Düne islet with a landfill.[58]

Flag

The Heligoland flag is very similar to its coat of arms – it is a tricolour flag with three horizontal bars, from top to bottom: green, red and white. Each of the colours has its symbolic meaning, as expressed in its motto:[59]

There is an alternative version in which the word German: Sand ("sand") is replaced with German: Strand ("beach").[60]

Road restrictions

A special section in the German traffic regulations (Straßenverkehrsordnung, abbr. StVO), §50, prohibits the use of automobiles and bicycles on the island.[61] Kick scooters are sometimes used as substitutes for bicycles.

There are very few cars on Heligoland; except for the local ambulance van and the small firetrucks, the only motor vehicles on the island are electrically powered and used primarily for moving material. The island received its first police car on 17 January 2006; until then the island's policemen moved on foot and by bicycle, being exempt from the bicycle ban.[62]

Emergency services

Ambulance services are provided by the Paracelsus North Sea Clinic Helgoland in co-operation with the State Rescue Service of Schleswig-Holstein (RKiSH). There are three ambulances available: one on the main island and one on Düne; the third is in reserve on the main island.

The ambulance service drives first to the Paracelsus North Sea Clinic. In the event of serious injuries or illnesses, the patients are transferred to the mainland either with a rescue helicopter or a sea rescue cruiser operated by the German Society for the Rescue of Shipwrecked Persons (DGzRS).

If there is an emergency on the Düne, the ambulance crew takes a boat to the Düne and carries out the operation with the ambulance based there.[63]

Fire protection and technical assistance are provided by the Helgoland volunteer fire brigade, which has three stations (Unterland, Oberland and Düne).The tasks also include ensuring fire protection during flight operations at the Heligoland-Düne airfield. Volunteer firefighters are deployed on Düne in the summer, who report for 14 days and go on holiday with their families on the island and go into action in an emergency.

There are normally five police officers based on Heligoland. They have the use of an electric car and a number of bicycles. In the summer months the population can also triple with up to 3,000 day-trippers and additional overnight visitors. Occasionally, the usual complement of police officers is supplemented by additional officers from the mainland during this period.

Since 2021, the so-called BOS centre, a joint service building for the fire brigade, ambulance service and police, has been under construction on the Oberland, and will incorporate five apartments for police staff on the upper floor.[64]

Notable residents

In culture

Leaders of Heligoland

Lieutenant-Governors

The British Lieutenant-Governors of Heligoland from 1807 to 1890 were:

See also

References

Further reading

Papers

Books

1890 cession

Second Reading in the House of Commons[==External links== {{wikivoyage|Heligoland}} * [http://www.criticalpast.com/video/65675040084_big-guns_dismantle-gun-emplacements_sea-defenses_man-sit-on-the-gun-barrel Film clip of coast defenses ]

Notes and References

  1. News: Heligoland: Germany's hidden gem in the North Sea . . 24 April 2011.
  2. Theodor Siebs: Helgoland und seine Sprache. Cuxhaven 1909, pp. 20 ff.
  3. Wolfgang Laur: Fositesland und die Bernsteininsel. In: ZSHG, Vol. 7475 (1951), p. 425.
  4. Reallexikon der germanischen Altertumskunde, Vol. 14, Artikel Helgoland. Berlin 1999.
  5. For example, in Heike Grahn-Hoek: Online Heiliges Land – Helgoland und seine früheren Namen. In: Uwe Ludwig, Thomas Schilp (eds.): Nomen et fraternitas. Festschrift für Dieter Geuenich zum 65. Geburtstag (Supplementary volumes to the Reallexikon des Germanischen Altertums). De Gruyter, Berlin 2008, ISBN 978-3-11-020238-0, p. 480.
  6. For example: Roter Flint und Heiliges Land. Helgoland zwischen Vorgeschichte und Mittelalter. Neumünster 2009, p. 70.
  7. Book: Ritsema, Alex . Heligoland, Past and Present . 2007 . 21–3 . . 978-1-84753-190-2.
  8. Book: University of Kiel, Schleswig-Holstein State Archaeological Museum . Schleswig-Holstein in 150 archäologischen Funden . de . Karl Wachholtz . . 1986 . 978-3-529-01829-9.
  9. https://books.google.com/books?id=8HO-fAcUrgsC&pg=PA39 Heligoland, Past and Present, p. 39
  10. Heligoland . 13 . 223.
  11. Encyclopaedia Britannica, 15th Edition, Micropaedia Volume IV, page 999,
  12. Ashley Cooper, page 40 History Today January 2014
  13. Ashley Cooper, page 41 History Today January 2014
  14. Book: Drower, George . Heligoland: The True Story of German Bight and the Island that Britain Betrayed . The History Press . 2002 . 9780752472805 . 80.
  15. Armstrong . Walter . 1889–1890 . Heligoland . . 7 . 773 . 18 June 2020.
  16. Book: Gätke, Heinrich . 1895 . Heligoland, an Ornithological Observatory . Rudolph Rosenstock . Edinburgh . David Douglas .
  17. Mollenhauer . D. . Lüning . K. . Helgoland and the history of research on marine benthic algae . Helgoländer Meeresuntersuchungen . 1988 . 42 . 3–4 . 385–425 . 10.1007/BF02365618 . 9189738 . free. 1988HM.....42..385M .
  18. Book: Halsey, Francis Whiting . History of the World War . Funk & Wagnalls Company . Ten . 1920 . New York . 15.
  19. Web site: Schönhammer . K. . Göttingen and Quantum Mechanics . University of Göttingen . 17 January 2023.
  20. Book: Rechenberg . Helmut . Werner Heisenberg – Die Sprache der Atome. Leben und Wirken . 2010 . Springer . 978-3-540-69221-8 . 322.
  21. Web site: Holm . Michael . Jagdstaffel Helgoland . de . 21 February 2010.
  22. http://www.spurensuche-kreis-pinneberg.de/spur/russische-kriegsgefangene-auf-helgoland-entwurf/ Lager russischer Offiziere und Soldaten, Helgoland Nordost
  23. Seekrieg: 1939 Dezember (Württemberg State Library, Stuttgart). Retrieved 4 July 2015.
  24. bremerhaven.de. Unter den Wellen Teil 3 – Britische U-Boote vor Helgoland . February 2013.
  25. Wolfgang Stelljes. Verräter kam aus den eigenen Reihen. In: Journal (weekend edition of Nordwest Zeitung), Volume 70, No. 84 (1112 April 2015), s. 1.
  26. Imke Zimmermann: Im Schutz der roten Felsen – Bunker auf Helgoland, vom 19. April 2005, auf fr-online.de
  27. http://www.halifaxlv827.co.uk/466missions.htm 466 Squadron Missions
  28. Web site: 8th Air Force 1944 Chronicles . 25 May 2007 . dead . https://web.archive.org/web/20070912155604/http://www.airwarweb.net/usaaf/8af_1944.php . 12 September 2007. June, July, August, September, October.
  29. Encyclopedia: 1942 USAAF Serial Numbers (42-57213 to 42-70685) . Encyclopedia of American Aircraft . 10 April 2007 . Joseph F. Baugher . dead . https://web.archive.org/web/20090130012608/http://home.att.net/~jbaugher/1942_3a.html . 30 January 2009.
  30. Encyclopedia: 1942 USAAF Serial Numbers (42-30032 to 42-39757) . Encyclopedia of American Aircraft . 10 April 2007 . Joseph F. Baugher . dead . https://web.archive.org/web/20090916173927/http://home.att.net/~jbaugher/1942_2.html . 16 September 2009.
  31. Web site: Campaign Diary . Royal Air Force Bomber Command 60th Anniversary . 24 May 2007 . UK Crown . dead . http://webarchive.nationalarchives.gov.uk/20070706011932/http://www.raf.mod.uk/bombercommand/diary.html . 6 July 2007. 1944: June, July, August, September, October, November, December .
  32. http://www.usaaf.net/chron/44/dec44.htm Combat Chronology of the US Army Air Forces – December 1944
  33. Web site: RAF – RAF Homepage . dead . http://webarchive.nationalarchives.gov.uk/20070706011932/http://www.raf.mod.uk/bombercommand/mar45.html . 6 July 2007.
  34. Web site: RAF – RAF Homepage . dead . http://webarchive.nationalarchives.gov.uk/20070706011932/http://www.raf.mod.uk/bombercommand/apr45.html . 6 July 2007.
  35. News: Naval installations blown up in Heligoland – archive, 1947 . The Guardian . 19 April 2022.
  36. News: 13 April 2007 . Der Tag, an dem Helgoland der Megabombe trotzte . . de . 13 April 2007.
  37. Book: Madsen, Chris . [{{Google books|nJTj4pD_XekC&pg |plainurl=yes}} The Royal Navy and German naval disarmament, 1942–1947 ]. 206 . Psychology Press . 1998 . 978-0-7-1464-823-1.
  38. Web site: 1. März 1952: Helgoland ist wieder deutsch . . 1 March 2012 . de . 17 September 2015.
  39. Web site: Council Directive 2006/112/EC of 28 November 2006 on the common system of value added tax . Eur-lex.europa.eu . 21 March 2022.
  40. Web site: REGULATION (EU) No 952/2013 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 October 2013 laying down the Union Customs Code . Eur-lex.europa.eu . 21 March 2022.
  41. http://www.tagesspiegel.de/politik/helgoland-weil-der-wind-sich-dreht/7135234.html Helgoland Weil der Wind sich dreht
  42. Wind Energy Comes of Age, Paul GipeJohn Wiley & Sons, 14 April 1995, p. 108
  43. Web site: Mit der Zukunft Geschichte schreiben . de . Dithmarscher Kreiszeitung . dead . https://web.archive.org/web/20110719053515/http://www.kreiszeitung-wesermarsch.de/Home/region/nordenham_Mit-der-Zukunft-Geschichte-schreiben-_arid%2C159098_regid%2C1.html . 19 July 2011.
  44. News: Pläne für Landaufschüttung auf Helgoland vom Tisch . de . . 16 June 2010 . 17 September 2015.
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