German submarine U-1277 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine during World War II.
She was ordered on 13 June 1942, and was laid down on 6 August 1943 at Bremer Vulkan AG, Bremen, as yard number 72. She was launched on 18 March 1944 and commissioned under the command of Oberleutnant zur See Ehrenreich-Peter Stever on 3 May 1944.
German Type VIIC/41 submarines were preceded by the heavier Type VIIC submarines. U-1277 had a displacement of 759t when at the surface and 860t 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 AEG GU 460/8–27 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-1277 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), one 3.7cm (01.5inches) Flak M42 and two 2sp=usNaNsp=us C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.
U-1277 is unusual in so much that it either did not receive Dönitz's surrender order on 8 May 1945, or chose to ignore it. What is known is that she continued her patrol in the North Atlantic for a further month, her crew finally scuttling her on 3 June 1945 off the northern coast of Portugal. All 47 crew disembarked safely from their sinking boat in rubber dinghies and made their way ashore, landing on the beach at Angeiras, Portugal. There they were interned by the Portuguese authorities, and handed over to a British warship a few days later. The crew were not released from a POW camp until 1947.
The wreck now lies in 100feet of water at 41.2167°N -53°W.