German submarine U-671
German submarine "U-671" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. The submarine was laid down on 2 December 1941 at the Howaldtswerke yard at Hamburg, launched on 15 December 1942, and commissioned on 3 March 1943 under the command of "Oberleutnant zur See" August-Wilhelm hewicker. Attached to 5th U-boat Flotilla based at Kiel, "U-671" completed her training period on 30 April 1944 and was assigned to front-line service. Design. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-671" 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-671" 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. Service history. On the second and last war patrol, "U-671" was detected by two British warships in the English Channel south of Brighton in the early hours of 4 August 1944. attacked with depth charges and hedgehogs causing severe damage to the  U-boat. "Stayner" was later joined by . Repeated attacks resulted in an oil spill and a number of survivors appeared at the surface. Of the crew of 52 all but five perished in the attack.