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German submarine U-678
German submarine ''U-678'' was a Type VIIC U-boat built for Nazi Germany's ''Kriegsmarine'' for service during World War II.
She was laid down on 3 September 1942 by Howaldtswerke, Hamburg as yard number 827, launched on 18 September 1943 and commissioned on 25 October 1943 under ''Oberleutnant zur See'' Guido Hyronimus.
==Design==
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. ''U-678'' 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 Siemens-Schuckert GU 343/38-8 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-678'' 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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