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
Date9 February 1945 (1945-02-09)
Location60°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
United Kingdom Lieutenant Jimmy Launders Nazi Germany 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.