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|commander2= |strength1= |strength2= |casualties1=Submarine sunk All 73 crew killed |casualties2=None }} Operation ''Caesar'' was a secret mission carried out by Germany in World War II to supply Germany's faltering ally, Japan, with advanced technology to fuel their war machine. The operation was a complete failure. The engagement that ended the mission is the only known instance in history of one submerged submarine sinking another submerged submarine. ==The operation == On 5 December 1944, ''U-864'', on her maiden voyage, was dispatched on a secret mission to deliver supplies to Japan. ''U-864s primary cargo was advanced Messerschmitt jet engine parts for use in Japanese aircraft〔 and V-2 missile guidance systems. Her secondary cargo comprised 65 tonnes of the strategic material mercury in 1,857 canisters for use in weapons production.〔 She left Kiel and headed north. While going through the Kiel Canal, ''U-864'' grounded and damaged her hull. Her captain, Ralf-Reimar Wolfram, decided to sail to the U-boat pens at Bergen, Norway. On 12 January 1945, while ''U-864'' was still undergoing repairs, British bombers attacked the pens, delaying the repairs further. The repairs were completed in early February and Wolfram embarked on his mission once again. British code breakers at Bletchley Park deciphered Enigma encoded transmissions and were alerted to ''U-864s mission. To counter the German U-boat, the Admiralty diverted the submarine HMS ''Venturer'', which had just left Lerwick in Scotland, to the coasts of Fedje, Norway to search for ''U-864''.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Operation Caesar」の詳細全文を読む スポンサード リンク
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