German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-629 had a displacement of 769t when at the surface and 871t while submerged. She had a total length of 67.1m (220.1feet), a pressure hull length of 50.5m (165.7feet), a beam of 6.2m (20.3feet), a height of 9.6m (31.5feet), and a draught of 4.74m (15.55feet). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of NaNPS for use while surfaced, two BBC GG UB 720/8 double-acting electric motors producing a total of 750PS for use while submerged. She had two shafts and two 1.23abbr=onNaNabbr=on 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-629 was fitted with five 53.30NaN0 torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.82NaN2 SK C/35 naval gun, 220 rounds, and one twin 2sp=usNaNsp=us C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.
The boat's career began with training at 5th U-boat Flotilla on 2 July 1942, followed by active service on 1 December 1942 as part of the 11th Flotilla. After eleven months she transferred to 1st Flotilla and stayed for the remainder of her service. In 11 patrols she sank no ships. During the eight patrol, on 4 January 1944 she was strafed and damaged in the Bay of Biscay by Wellington bomber from No. 304 Polish Bomber Squadron, but managed to return to Brest.[1]
U-629 took part in seven wolfpacks, namely:
U-629 was sunk on 7 June 1944 in the English Channel in position 48.5667°N -28°W, by depth charges from a RAF Liberator of 53 Squadron. All hands were lost.