German submarine U-778

German submarine U-778 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine in World War II. She only completed one combat patrol and sank no Allied ships. She was surrendered to the Allies at Bergen on 9 May 1945.

Design
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-778 had a displacement of 769 t when at the surface and 871 t while submerged. She had a total length of 67.10 m, a pressure hull length of 50.50 m, a beam of 6.20 m, a height of 9.60 m, and a draught of 4.74 m. The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2800 to 3200 PS for use while surfaced, two Garbe, Lahmeyer & Co. RP 137/c double-acting electric motors producing a total of 750 PS for use while submerged. She had two shafts and two 1.23 m propellers. The boat was capable of operating at depths of up to 230 m.

The submarine had a maximum surface speed of 17.7 kn and a maximum submerged speed of 7.6 kn. When submerged, the boat could operate for 80 nmi at 4 kn; when surfaced, she could travel 8500 nmi at 10 kn. U-778 was fitted with five 53.3 cm torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm SK C/35 naval gun, (220 rounds), one 3.7 cm Flak M42 and two twin 2 cm C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.

Service history
The boat arrived at Horten in Norway on 28 February 1945 under the command of Oberleutnant zur See Ralf Jürs. She left Horten on her only war patrol on 4 March, completing the 23-day patrol on the 26 March 1945 at Bergen in Norway. No ships were sunk during the patrol and the U-boat was still at Bergen when she was surrendered to the Allies some six weeks later on 9 May 1945.

On 4 December 1945, she was being towed offshore by the Royal Navy, to be scuttled as part of Operation Deadlight, but foundered and sank before reaching the scuttling ground, at a point 55.53333°N, -7.11667°W, 16 nmi North East of Malin Head in around 70 m of water.

Proposed salvage
The wreck was rediscovered by marine archaeologist Innes McCartney in 2001. In 2007, Derry City Council announced plans to raise the boat to be the main exhibit of a new maritime museum. Many of the other Operation Deadlight U-boats were used for target practice and sunk by gunfire, torpedoes, rockets or bombs. U-778, by contrast, is remarkably intact and lies in relatively shallow water.

On 3 October 2007 an Irish diver died whilst filming the wreck as part of the salvage project. In November 2009, a spokesman from the council's heritage museum service announced the salvage project had been cancelled for cost reasons.