German submarine U-966 was a Type VIIC U-boat of the German Navy (Kriegsmarine) during World War II. She was ordered on 5 June 1941, and was laid down on 1 May 1942 at Blohm & Voss, Hamburg, as yard number 166. She was launched on 14 January 1943 and commissioned under the command of Oberleutnant zur See Eckehard Wolf on 4 March 1943. Design German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-966 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 Garbe, Lahmeyer & Co. RP 137/c 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-966 was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes or 26 TMA mines, one SK C/35 naval gun, 220 rounds, and one twin C/30 anti-aircraft gun. The boat had a complement of 44 to 52 men. Service history On 10 November 1943, U-966 was attacked by an RAF Wellington of 612 Squadron/B and then US Navy B-24 Liberators of squadrons VB-103 and VB-110. Later that day Liberator GR Mk V BZ774/D of the RAF's Czechoslovak-crewed 311 Squadron/D sighted U-966 at . The submarine headed for the neutral Spanish coast at full speed but at 13:54 BZ774/D attacked her with wing-mounted SAP60 semi-armour piercing rocket projectiles (RPs). Several of the RPs failed to function, and the Czechoslovak aircrew was unable to see any effects on the target from those that did. But U-966 slowed to an estimated six to eight knots, and then within of the Spanish coast she slowed to two knots before running aground. 42 of her 50 crew survived. They scuttled her in the Bay of Biscay off O Porto de Bares, Galicia, Spain, after several depth charge attacks badly damaged her, then took to