DOD: A U.S. Navy P-5M aircraft ditched in Puget Sound off Whidbey Island, Washington. It was carrying an unarmed nuclear antisubmarine weapon containing no nuclear material. The weapon was not recovered. The crew of ten was rescued. The prime mission of the P-5M was anti-submarine warfare. Weapons used for this purpose include nuclear depth charges which have an explosive power of 5-10 kilotons (one kiloton equals 1,000 tons of TNT). The bomb dropped on Hiroshima has been estimated to have been 13.5 kilotons.