SM UB-23
SM "UB-23" was a German Type UB II submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 30 April 1915 and launched on 9 October 1915. She was commissioned into the Imperial German Navy on 13 March 1916 as SM "UB-23". The submarine sank 51 ships in 21 patrols for a total of . On 26 July 1917, "UB-23" was badly damaged by a depth charge attack by off the Lizard; she put in at Corunna, Spain, on 29 July 1917 and was interned. On 22 January 1919 she  was surrendered to France in accordance with the requirements of the Armistice with Germany, and she was broken up in Cherbourg in July 1921. Design. A German Type UB II submarine, "UB-23" had a displacement of when at the surface and while submerged. She had a total length of , a beam of , and a draught of . The submarine was powered by two Körting six-cylinder, four-stroke diesel engines each producing a total , a Siemens-Schuckert electric motor producing , 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-23" was fitted with two torpedo tubes, four torpedoes, and one SK L/40 deck gun. She had a complement of twenty-one crew members and two officers and a 45-second dive time.