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Japanese submarine I-52 (1942)
, code-named was a Type C-3 cargo submarine of the Imperial Japanese Navy used during World War II for a secret mission to Lorient, France, then occupied by Germany, during which she was sunk.
==Valuable cargo==
She is also known as Japan's "Golden Submarine", because she was carrying a cargo of gold to Germany as payment for matériel and technology. There has been speculation that a peace proposal to the Allies was contained on board the ''I-52'' as well, but this is unlikely on two counts: there is no evidence that the Japanese government was interested in peace proposals or negotiated settlements at that stage in the war; and the Japanese kept an open dialogue with their diplomatic attachés via radio and diplomatic voucher through Russia, and had no need for long and uncertain transfer via a submarine bound for a Nazi-controlled area of western Europe.
It is believed that 800 kg (1,000-lbs) of uranium oxide awaited ''I-52'' for her return voyage at Lorient according to Ultra decrypts. It has been speculated that this was for the Japanese to develop a radiological weapon (a so-called "dirty bomb") for use against the United States. (The amount of unenriched uranium oxide would not have been enough to create an atomic bomb, though if used in a nuclear reactor it could have created poisonous fission products).〔Billings, Richard N. Battleground Atlantic: How The Sinking of a Single Japanese Submarine Assured the Outcome of World War II, NAL Hardcover, 2006, 311pp, ISBN 0-451-21766-7〕
She was also to be fitted with a snorkel device at Lorient. In addition, 35 to 40 tons of secret documents, drawings, and strategic cargo awaited ''I-52s return trip to Japan: T-5 acoustic torpedoes, a Jumo 213-A motor used on the long-nosed FW-190D fighter, radar equipment, vacuum tubes, ball bearings, bombsights, chemicals, alloy steel, and optical glass.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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