German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-759 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged.[3] She had a total length of 67.10 m (220 ft 2 in), a pressure hull length of 50.50 m (165 ft 8 in), a beam of 6.20 m (20 ft 4 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder superchargeddiesel 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. RP 137/c double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).[3]
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).[3] 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). U-759 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 two twin 2 cm (0.79 in) C/30anti-aircraft guns. The boat had a complement of between forty-four and sixty.[3]
U-759 first sailed from Kiel on 2 February 1943, and out into the Atlantic, south of Greenland. She had no successes, and arrived at Lorient, France on 14 March after 41 days.[4]
U-759 left Lorient on 7 June 1943 and sailed across the Atlantic to the Caribbean Sea.[5] There on 5 July, about 70 nautical miles (130 km) west of Port-Salut, Haiti, she torpedoed the 3,513 GRT American merchant ship Maltran, part of Convoy GTMO-134. The ship sank in 15 minutes, but all 47 aboard escaped in lifeboats, and were picked up by USS SC-1279.[6]
Two days later, on 7 July, the U-boat torpedoed and sank the 9,251 GRT Dutch cargo ship Poelau Roebiah, in convoy TAG-70, east of Jamaica. All but two of the 68 crew, along with 24 armed guards and 31 US passengers abandoned ship in four lifeboats and were later rescued.[7] After sinking the Dutch ship the U-boat was pursued and attacked by the United States destroyer Tattnall (DD-125), but escaped.[1] The next day, 8 July, U-759 was spotted and attacked by a United States Navy scout aircraft. Allied surface ships attacked for seven hours, but the U-boat evaded them and escaped unharmed.[1]
Busch, Rainer; Röll, Hans-Joachim (1999). German U-boat commanders of World War II : a biographical dictionary. Translated by Brooks, Geoffrey. London, Annapolis, Md: Greenhill Books, Naval Institute Press. ISBN1-55750-186-6.