German submarine U-777

German submarine U-777 was a German Type VIIC U-boat built in World War II, launched on 25 March 1944, and commissioned on 9 May, by its sole commander, Oberleutnant Günter Ruperti. It underwent training with the 31st U-boat Flotilla, but did not participate in any patrols during its five-month career of active service. It was destroyed at 20:02 hours on the night of 15/16 October 1944, during a British air raid on Wilhelmshaven, Germany, at position 53.85°N, 8.16667°W. One crewman was killed.

Other notes

 * Despite the fact that many other U-boats lost men due to accident, disease and various other causes, the crew of GS U-777 did not suffer any casualties until she was destroyed and was sunk.
 * The commander of the ship, Günter Ruperti, also commanded GS U-3039 during World War II, by which time he had been promoted to Kapitänleutnant. He commanded U-3039 from March 1945 to May 1945, taking up his post only about five months after U-777 was sunk.