On 1 November, U-755 began travelling from Brest to La Spezia in Italy, after a further twenty-two days at sea. U-755 docked at Brest on 6 October, after sixty-four days at sea. At 15:16 on 9 September 1942, she fired a spread of three torpedoes at the USS Muskeget, two hits were reported. On 9 September 1942 – thirty-four days into her first patrol- U-755 sank her first ship. Serving with 9th U-boat Flotilla, she served in two patrols.
She was commissioned on 3 November 1941, under the command of Kapitänleutnant Walter Göin and trained with 5th U-Boat Flotilla until 31 July 1942. Work on U-755 began on 11 January 1940 at the Kriegsmarinewerft in Wilhelmshaven. The boat had a complement of between forty-four and sixty. U-755 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and a 2 cm (0.79 in) C/30 anti-aircraft gun. When submerged, the boat could operate for 80 nautical miles (150 km 92 mi) at 4 knots (7.4 km/h 4.6 mph) when surfaced, she could travel 8,500 nautical miles (15,700 km 9,800 mi) at 10 knots (19 km/h 12 mph). The submarine had a maximum surface speed of 17.7 knots (32.8 km/h 20.4 mph) and a maximum submerged speed of 7.6 knots (14.1 km/h 8.7 mph). The boat was capable of operating at depths of up to 230 metres (750 ft). She had two shafts and two 1.23 m (4 ft) propellers. RP 137/c double-acting electric motors producing a total of 750 metric horsepower (550 kW 740 shp) for use while submerged. The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW 2,760 to 3,160 shp) for use while surfaced, two Garbe, Lahmeyer & Co. U-755 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-755 served with 9th U-boat Flotilla in the Atlantic, and later with 29th U-boat Flotilla operated in the Mediterranean Sea. Under the command of Kapitänleutnant Walter Göing.
German submarine U-755 was a German Type VIIC submarine U-boat built for Nazi Germany's Kriegsmarine for service during World War II. 5 × 53.3 cm (21 in) torpedo tubes (four bow, one stern).
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