SM UC-6 was a German Type UC I minelayer submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat had been ordered by November 1914 and was launched on 20 June 1915. She was commissioned into the German Imperial Navy on 24 June 1915 as SM UC-6.[1] Mines laid by UC-6 in her 89 patrols were credited with sinking 55 ships.
A Type UC I submarine, UC-6 had a displacement of 168t when at the surface and 183t while submerged. She had a length overall of 33.99m (111.52feet), a beam of 3.15m (10.33feet), and a draught of 3.040NaN0. The submarine was powered by one Daimler-Motoren-Gesellschaft six-cylinder, four-stroke diesel engine producing 90PS, an electric motor producing 175PS, and one propeller shaft. She was capable of operating at a depth of .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UC-6 was fitted with six mine tubes, twelve UC 120 mines, and one 8mm machine gun. She was built by AG Vulcan Stettin and her complement was fourteen crew members.
UC-6 sailed from Zeebrugge on 27 September 1917 to lay mines off the Kentish Knock and did not return. She was later reported by British patrols that strong explosions had occurred in explosive nets laid in the area that same day. Other sources, however, state that UC-6 was destroyed by a British seaplane on 28 September 1917.[2]
| Date | Name | Nationality | Tonnage[3] | Fate[4] | |
|---|---|---|---|---|---|
| 14 August 1915 | HMT Worsley | 309 | Sunk | ||
| 16 August 1915 | HMT Japan | 205 | Sunk | ||
| 25 August 1915 | Disa |  Sweden | 788 | Sunk | |
| 28 August 1915 | HMT Dane | 265 | Sunk | ||
| 29 August 1915 | Sir William Stephenson |  United Kingdom | 1,540 | Sunk | |
| 16 September 1915 | Africa | United Kingdom | 1,038 | Sunk | |
| 18 September 1915 | HMT Lydian | 244 | Sunk | ||
| 18 September 1915 | San Zeferino | United Kingdom | 6,430 | Damaged | |
| 20 September 1915 | Horden | United Kingdom | 1,434 | Sunk | |
| 23 September 1915 | Groningen | United Kingdom | 988 | Sunk | |
| 24 September 1915 | HMD Great Heart | 78 | Sunk | ||
| 27 September 1915 | Nigretia | United Kingdom | 3,187 | Damaged | |
| 5 October 1915 | Alose | 214 | Sunk | ||
| 18 October 1915 | Aleppo | United Kingdom | 3,870 | Damaged | |
| 18 October 1915 | Salerno |  Norway | 2,431 | Sunk | |
| 21 October 1915 | Monitoria | United Kingdom | 1,904 | Sunk | |
| 31 October 1915 | HMY Aries | 268 | Sunk | ||
| 31 October 1915 | Eidsiva | Norway | 1,092 | Sunk | |
| 31 October 1915 | HMT Othello II | 206 | Sunk | ||
| 31 October 1915 | Toward | United Kingdom | 1,218 | Sunk | |
| 3 November 1915 | Friargate | United Kingdom | 264 | Sunk | |
| 12 November 1915 | Moorside | United Kingdom | 311 | Sunk | |
| 12 November 1915 | Nigel | United Kingdom | 1,400 | Sunk | |
| 12 January 1916 | Traquair | United Kingdom | 1,067 | Sunk | |
| 12 February 1916 | Leicester | United Kingdom | 1,001 | Sunk | |
| 21 February 1916 | HMT Carlton | 267 | Sunk | ||
| 24 February 1916 | Trignac |  France | 2,375 | Sunk | |
| 27 February 1916 | Empress of Fort William | United Kingdom | 2,181 | Sunk | |
| 27 February 1916 | United Kingdom | 12,431 | Sunk | ||
| 28 February 1916 | HMT Angelus | 304 | Sunk | ||
| 28 February 1916 | HMT Weigelia | 262 | Sunk | ||
| 4 March 1916 | HMT Flicker | 192 | Sunk | ||
| 23 March 1916 | HMT Corona | 212 | Sunk | ||
| 23 March 1916 | Sea Serpent | United Kingdom | 902 | Sunk | |
| 24 March 1916 | Christianssund |  Denmark | 1,017 | Sunk | |
| 26 March 1916 | Saint Cecilia | United Kingdom | 4,411 | Sunk | |
| 7 April 1916 | Halcyon | United Kingdom | 1,319 | Sunk | |
| 14 April 1916 | Shenandoah | United Kingdom | 3,886 | Sunk | |
| 21 April 1916 | Estafette | 267 | Sunk | ||
| 29 April 1916 | Saint Corentin | 216 | Sunk | ||
| 16 May 1916 | Batavier V |  Netherlands | 1,569 | Sunk | |
| 26 May 1916 | Volharding |  Belgium | 1,000 | Sunk | |
| 1 June 1916 | Excellenz Mehnert | Norway | 646 | Sunk | |
| 8 June 1916 | HMT Kaphreda | 245 | Sunk | ||
| 19 June 1916 | Corton Light Vessel | United Kingdom | unknown | Sunk | |
| 19 June 1916 | Saint Jacques | France | 72 | Sunk | |
| 21 June 1916 | Otis Tarda | Netherlands | 759 | Sunk | |
| 23 June 1916 | Burma | United Kingdom | 706 | Sunk | |
| 27 June 1916 | Waalstroom | Netherlands | 1,441 | Sunk | |
| 29 June 1916 | HMT Hirose | 275 | Sunk | ||
| 7 July 1916 | Gannet | United Kingdom | 1,127 | Sunk | |
| 10 July 1916 | Kara | United Kingdom | 2,338 | Sunk | |
| 3 September 1916 | Mascotte | United Kingdom | 1,097 | Sunk | |
| 2 October 1916 | HMD Girl Eva | 76 | Sunk | ||
| 29 December 1916 | Lonada | United Kingdom | 1,286 | Sunk | |
| 29 December 1916 | HMS Ludlow | 810 | Sunk | ||
| 29 December 1916 | HMS Totnes | 810 | Damaged | ||
| 22 February 1917 | Ashtabula | United Kingdom | 7,025 | Damaged | |
| 31 March 1917 | HMD Forward III | 89 | Sunk | ||
| 19 April 1917 | Lumina | United Kingdom | 5,856 | Damaged | |
| 12 May 1917 | Waterville | United Kingdom | 1,968 | Damaged | |
| 7 June 1917 | HMS Mercury | 378 | Damaged | ||
| 16 June 1917 | Roald Amundsen | Norway | 4,390 | Damaged | |
| 18 June 1917 | Dorte Jensen | Denmark | 2,086 | Sunk |