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German submarine U-644
German submarine ''U-644'' was a Type VIIC U-boat of Nazi Germany's ''Kriegsmarine'' during World War II. The submarine was laid down on 1 December 1941 at the Blohm & Voss yard at Hamburg, launched on 20 August 1942, and commissioned on 15 October 1942 under the command of ''Oberleutnant zur See'' Kurt Jensen.
Attached to ''5th U-boat Flotilla'' based at Kiel, ''U-644'' completed her training period on 31 March 1943 and was assigned to front-line service.
==Design==
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. ''U-644'' 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 Brown, Boveri & Cie GG UB 720/8 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-644'' was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one , 220 rounds, and an anti-aircraft gun. The boat had a complement of between forty-four and sixty.
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