On April 21, 1915, during World War I, the Yasaka Maru was sunk by a German submarine in the Mediterranean Sea. The ship was on its way back from London with 100,000 pounds of gold bullion (about 1,000,000 yen at the time) from Tokyo Marine. On August 7, 1925, the Japan Deep Sea Industries Co. On August 7, 1925, the Japan Deep Sea Research Institute succeeded in salvaging more than 560,000 yen in gold coins from the ocean floor at a depth of 70 meters. 100 Million People's History of the Showa Era" (11), p. 221.
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