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SM UB-31
SM ''UB-31'' was a German Type UB II submarine or U-boat in the German Imperial Navy ((ドイツ語: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''.〔"SM" stands for "Seiner Majestät" ((英語:His Majesty's)) and combined with the ''U'' for ''Unterseeboot'' would be translated as ''His Majesty's Submarine''.〕 The submarine sank 26 ships in 25 patrols. ''UB-31'' was depth charged and sunk by British warships , , and in the English Channel on 2 May 1918. ==Design== A German Type UB II submarine, ''UB-31'' had a displacement of when at the surface and while submerged. It had a total length of , a beam of , and a draught of . The submarine was powered by two Benz six-cylinder diesel engines each producing a total , a Siemens-Schuckert electric motor producing , and one propeller shaft. It 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, it could operate for at ; when surfaced, it could travel at . ''UB-31'' was fitted with two torpedo tubes, four torpedoes, and one SK L/40 deck machine gun. It had a complement of twenty-one crew members and two officers and a 42-second dive time.
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