The wreck of World War II submarine USS Grayback has been discovered off Japan 75 years after its sinking by a Japanese bomber. The submarine was found on June 5, by the Lost 52 Project, which locateslost U.S. World War II submarines. In a statement translated from Japanese, the Lost 52 Project explained that the USS Grayback SS-208 is the first U.S. submarine discovered off the coast of Japan. Japanese records indicate that the sub was sunk by a 500-pound bomb dropped by a naval bomber in February 1944. The bomb hit aft of… Reference from FoxNews Science