SM UB-30
SM "UB-30" 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 22 July 1915 and launched on 16 November 1915. She was commissioned into the German Imperial Navy on 18 March 1916 as SM "UB-30". The submarine sank 18 ships in 19 patrols. They included the William Cory & Son collier SS "Vernon" in the North Sea off Spurn on 31 August 1917 and the Witherington and Everett Steam Ship Company collier SS "Lightfoot" in the English Channel off Selsey Bill on 16  March 1918. "UB-30" was sunk by two depth charges from HMS Landrail south of Goodwin Sands at on 13 August 1918. Design. A German Type UB II submarine, "UB-30" 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 Benz six-cylinder diesel engines producing a total , two Siemens-Schuckert electric motors 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-30" was fitted with two torpedo tubes, four torpedoes, and one Uk L/30 deck gun. She had a complement of twenty-one crew members and two officers and a 42-second dive time.