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 769 t when at the surface and 871 t while submerged. She had a total length of 67.10 m, a pressure hull length of 50.50 m, a beam of 6.20 m, a height of 9.60 m, and a draught of 4.74 m. The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2800 to 3200 PS for use while surfaced, two Brown, Boveri & Cie GG UB 720/8 double-acting electric motors producing a total of 750 PS for use while submerged. She had two shafts and two 1.23 m propellers. The boat was capable of operating at depths of up to 230 m.

The submarine had a maximum surface speed of 17.7 kn and a maximum submerged speed of 7.6 kn. When submerged, the boat could operate for 80 nmi at 4 kn; when surfaced, she could travel 8500 nmi at 10 kn. U-620 was fitted with five 53.3 cm torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm SK C/35 naval gun, 220 rounds, and a 2 cm 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:
 * Luchs (27 September – 6 October 1942)
 * Panther (6 – 11 October 1942)
 * Leopard (12 – 19 October 1942)
 * Südwärts (24 – 26 October 1942)
 * Delphin (26 December 1942 – 13 February 1943)

Fate
U-620 was sunk on 13 February 1943 in the North Atlantic in position 39.3°N, -11.28333°W, by depth charges from a Royal Air Force (RAF) Consolidated Catalina of No. 202 Squadron RAF, for the loss of all hands.