German submarine U-721
German submarine "U-721" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. The submarine was laid down on 16 November 1942 at the H. C. Stülcken Sohn yard at Hamburg, launched on 23 July 1943, and commissioned on 8 November 1943 under the command of "Oberleutnant zur See" Otto Wollschläger. Design. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-721" had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam of , a height  of , and a draught of . The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two Garbe, Lahmeyer & Co. RP 137/c double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat 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, the boat could operate for at ; when surfaced, she could travel at . "U-721" was fitted with five torpedo tubes  (four fitted at the bow and one at the stern), fourteen torpedoes, one SK C/35 naval gun, 220 rounds, and two twin C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty. Fate. The final action of the submarine was during Operation Hannibal when it evacuated some 100 civilians and wounded soldiers. It was scuttled on 5 May 1945 in Geltinger Bucht as part of Operation Regenbogen and later raised and broken up for scrap.