Apomaru is an ocean-going tanker built in Japan1940s, with a length of154.9m, a width of 20.2m, a depth of12.6m and a gross tonnage of1249.4t.. On March 28th, 1945, the Apomaru, which had been requisitioned by the Japanese army, loaded a large number of Japanese troops retreating from Southeast Asia in Singapore and sailed for Japan. At midnight on April 1, the ship sailed to the east of Niushan Island, Fujian Province, China, and was discovered by the American submarine "Queen Fish" cruising in the sea area. It was attacked by several torpedoes and sank quickly after three minutes. Except for 1 person, 2,009 passengers and crew, as well as 40 tons of gold, 12 tons of platinum, about 40 boxes of jewelry and cultural relics, 3,000 tons of tin ingots, 3,000 tons of rubber and thousands of tons of rice loaded on board, all sank to the bottom of the sea.