Operation Caesar

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Operation Caesar
Part of The Second World War
Location of U-864
Date 5 December 1944 – 9 February 1945 Location North Sea 60°46′10″N 4°37′15″E / 60.76944°N 4.62083°E / 60.76944; 4.62083 Result British victory
Belligerents
Germany	United Kingdom
Commanders and leaders
Ralf-Reimar Wolfram †	Jimmy Launders
Strength
U-864 (Type IX U-boat)	HMS Venturer (V-class submarine)
Casualties and losses
U-864 sunk 73 crew and passengers killed	None

Operation Caesar (Unternehmen Kaiser) was a secret mission carried out by Germany in the Second World War to supply Japan with advanced technology. The operation failed due to the sinking of U-864 by a British submarine, the only known example of a submerged submarine sinking another submerged submarine.^[1]