German submarine U-802 was a Type IXC/40 U-boat built for Nazi Germany's Kriegsmarine during World War II.
German Type IXC/40 submarines were slightly larger than the original Type IXCs. U-802 had a displacement of 1144t when at the surface and 1257t while submerged. The U-boat had a total length of 76.76m (251.84feet), a pressure hull length of 58.75m (192.75feet), a beam of 6.86m (22.51feet), a height of 9.6m (31.5feet), and a draught of 4.67m (15.32feet). The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of 4400PS for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of 1000shp for use while submerged. She had two shafts and two 1.92abbr=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-802 was fitted with six 53.30NaN0 torpedo tubes (four fitted at the bow and two at the stern), 22 torpedoes, one 10.52NaN2 SK C/32 naval gun, 180 rounds, and a 3.7sp=usNaNsp=us SK C/30 as well as a 2sp=usNaNsp=us C/30 anti-aircraft gun. The boat had a complement of forty-eight.
Laid down on 1 December 1941, U-802 was launched eleven months later on 31 October 1942. On 12 June 1943 the U-boat was commissioned into service under the command of Kapitänleutnant Rolf Steinhaus (Crew 36).
In September 1943, Kapitänleutnant Helmut Schmoeckel (Crew 36) joined the crew of U-802 as a trainee commander. Schmoeckel finally relieved Steinhaus and took command of U-802 on 12 December 1943. Transferring from 4th U-boat Flotilla to 2nd U-boat Flotilla.
U-802 left base in Kiel on 29 January 1944 and after brief stops in Kristiansand and Stavanger she reached her assigned patrol area in the North Atlantic in mid-February. In late March and early April U-801 attacked several convoys, sinking the Canadian 1621 GRT steamer and possibly two more steamers from convoy SH 125 in 44.5°N -113°W on 22 March 1944. In an attack on convoy HX 286 she claimed two more steamers of 10,000 GRT sunk or damaged respectively. On 2 May 1944 the U-boat arrived in Lorient.
U-802 set out from Lorient on her second patrol on 22 June 1944, but when her snorkel failed on 1 July, she made for port. After experiencing an air attack earlier that day, U-802 arrived back in Lorient on 9 July 1944.
On 16 July the U-boat left again for operations in the West and North Atlantic. In mid-August U-802 made contact with an aircraft carrier but did not attack, but claimed an escort,, sunk on 14 September 1944. However, this was proved incorrect; HMCS Stettler survived the war. On 12 November 1944, she returned to base via Norway to Flensburg.
From Flensburg U-802 left again for the West Atlantic on 11 December 1944 to return to Kiel on 8 April 1945 after 118 days at sea. The last weeks of war in Europe U-802 spent in Norwegian waters.
Leaving Bergen on 3 May, U-802 arrived in Loch Eriboll on 11 May 1945 in order to surrender to the British. The U-boat was transferred to Loch Alsh the next day, and to Lisahally the day after that, where she remained until the end of the year. On 30 December 1945 U-802 left Moville under tow from . At 12:30h the next day, 31 December 1945, the cable broke and U-802 sank at 55.5°N -33°W.