Sinking of U-864

Action of 9 February 1945
Part of The Battle of the Atlantic during the Second World War
HMS Venturer in August 1943
Date 9 February 1945 (1945-02-09) Location Off Fedje Island, Norway 60°46′10″N 4°37′15″E / 60.76944°N 4.62083°E / 60.76944; 4.62083 Result British victory
Belligerents
United Kingdom	Germany
Commanders and leaders
Lieutenant Jimmy Launders	Korvettenkapitän Ralf-Reimar Wolfram †
Units involved
HMS Venturer	U-864
Casualties and losses
None	U-864 with all 73 hands

The German U-boat U-864 was attacked and sunk on 9 February 1945 by HMS Venturer, a V-class submarine of the Royal Navy. Venturer was patrolling the waters around Fedje Island, off the Norwegian coast in the North Sea. The sinking remains the only incident in the history of naval warfare where one submarine sank another while both were submerged.