SM UB-22

SM UB-22 was a German Type UB II submarine or U-boat in the German Imperial Navy (Kaiserliche Marine) during World War I. The U-boat was ordered on 30 April 1915 and launched on 9 October 1915. She was commissioned into the German Imperial Navy on 2 March 1915 as SM UB-22. The submarine sank 27 ships in 18 patrols for a total of. UB-22 was mined and sunk in the same incident with the torpedoboat SMS S16 (1912) in the North Sea at 54.66667°N, 6.53333°W on 19 January 1918 in a British minefield.

Design
A Type UB II submarine, UB-22 had a displacement of 263 t when at the surface and 292 t while submerged. She had a total length of 36.13 m, a beam of 4.36 m, and a draught of 3.70 m. The submarine was powered by two Körting six-cylinder, four-stroke diesel engines each producing a total 280 PS, a Siemens-Schuckert electric motor producing 206 kW, and one propeller shaft. She was capable of operating at depths of up to 50 m.

The submarine had a maximum surface speed of 9.15 kn and a maximum submerged speed of 5.81 kn. When submerged, she could operate for 45 nmi at 4 kn; when surfaced, she could travel 6650 nmi at 5 kn. UB-22 was fitted with two 50 cm torpedo tubes, four torpedoes, and one 5 cm SK L/40 deck gun. She had a complement of twenty-one crew members and two officers and a 45-second dive time.