SM UB-31 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 22 July 1915 and launched on 16 November 1915. She was commissioned into the German Imperial Navy on 25 March 1916 as SM UB-31.
The submarine sank 27 ships in 25 patrols. UB-31 was depth charged and sunk by British warships,, and in the English Channel on 2 May 1918. Alternatively she may have been sunk by a mine on that date.[1]
A Type UB II submarine, UB-31 had a displacement of 274t when at the surface and 303t while submerged. She had a total length of 36.9m (121.1feet), a beam of 4.37m (14.34feet), and a draught of 3.69m (12.11feet). The submarine was powered by two Benz six-cylinder diesel engines producing a total 270PS, two Siemens-Schuckert electric motors producing 280PS, and one propeller shaft. She was capable of operating at depths of up to .
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 . UB-31 was fitted with two torpedo tubes, four torpedoes, and one 8.8sp=usNaNsp=us Uk L/30 deck gun. She had a complement of twenty-one crew members and two officers and a 42-second dive time.
Date | Name | Nationality | Tonnage[2] | Fate[3] | |
---|---|---|---|---|---|
9 April 1917 | Kittiwake | United Kingdom | 1,866 | Sunk | |
24 April 1917 | Saint Jacques | France | 415 | Damaged | |
28 April 1917 | United Kingdom | 12,350 | Sunk | ||
21 May 1917 | City of Corinth | United Kingdom | 5,870 | Sunk | |
15 June 1917 | Teesdale | United Kingdom | 2,470 | Damaged | |
17 June 1917 | Stanhope | United Kingdom | 2,854 | Sunk | |
5 July 1917 | Ocean Swell | United Kingdom | 195 | Sunk | |
6 July 1917 | Ariadne Christine | United Kingdom | 3,550 | Damaged | |
7 July 1917 | Bellucia | United Kingdom | 4,368 | Sunk | |
10 July 1917 | Hildegard | United States | 622 | Sunk | |
11 July 1917 | Brunhilda | United Kingdom | 2,296 | Sunk | |
1 August 1917 | Alcyone | United Kingdom | 149 | Sunk | |
1 August 1917 | Laertes | United Kingdom | 4,541 | Sunk | |
2 August 1917 | Newlyn | United Kingdom | 4,019 | Sunk | |
3 August 1917 | Renee Marthe | France | 49 | Sunk | |
8 August 1917 | Algerie | France | 3,386 | Damaged | |
8 September 1917 | Elizabeth | United Kingdom | 58 | Sunk | |
9 September 1917 | Pluton | Norway | 1,449 | Sunk | |
19 October 1917 | Waikawa | United Kingdom | 5,666 | Sunk | |
20 October 1917 | Colorado | United Kingdom | 7,165 | Sunk | |
23 October 1917 | Lepanto | United Kingdom | 6,389 | Damaged | |
19 November 1917 | Farn | United Kingdom | 4,393 | Sunk | |
13 December 1917 | Britannic | United Kingdom | 92 | Sunk | |
15 December 1917 | Sachem | United Kingdom | 5,354 | Damaged | |
18 December 1917 | Riversdale | United Kingdom | 2,805 | Sunk | |
20 December 1917 | Alice Marie | United Kingdom | 2,210 | Sunk | |
20 December 1917 | Eveline | United Kingdom | 2,605 | Sunk | |
20 December 1917 | Warsaw | United Kingdom | 608 | Sunk | |
22 January 1918 | Admiral Cochrane | United Kingdom | 6,565 | Damaged | |
22 January 1918 | Greatham | United Kingdom | 2,338 | Sunk | |
24 January 1918 | Elsa | Norway | 3,581 | Sunk | |
28 February 1918 | Heenvliet | Netherlands | 492 | Sunk | |
20 March 1918 | Boorara | Australia | 6,570 | Damaged | |
24 April 1918 | Agnete | United Kingdom | 1,127 | Sunk | |
25 April 1918 | Joseph | France | 42 | Sunk |