German submarine U-620
German submarine "U-620" was a Type VIIC U-boat built for Nazi Germany's "Kriegsmarine" for service during World War II. She was laid down on 19 June 1941 by Blohm & Voss, Hamburg as yard number 596, launched on 9 March 1942 and commissioned on 30 April 1942 under "Oberleutnant zur See" Heinz Stein. Design. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-620" 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-620" 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 a C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty. Service history. The boat's career began with training at 8th U-boat Flotilla on 30 April 1942, followed by active service on 1 October 1942 as part of the 3rd Flotilla for the remainder of her service. In 2 patrols she sank 1 merchant ships, for a total of . Wolfpacks. "U-620" took part in five wolfpacks, namely: Fate. "U-620" was sunk on 13 February 1943  in the North Atlantic in position , by depth charges from a Royal Air Force (RAF) Consolidated Catalina of No. 207 Squadron RAF, for the loss of all hands.