I-14, and the submarine rescue vessel . The ships encountered a heavy storm during their voyage, and the American crews of I-400 and I-401 noted that the I-400-class submarines′ double-hull construction allowed them to ride remarkably smoothly in the heavy seas. The vessels arrived at Sasebo on 1 November 1945. After loading Japanese motor launches onto their decks to serve as lifeboats, I-400, I-401, and I-14 departed Sasebo on 11 December 1945 under escort by Greenlet bound for Pearl Harbor, Hawaii, stopping along the way at Apra Harbor on Guam in the Mariana Islands from 18 to 21 December 1945, then at Eniwetok in the Marshall Islands, and then at Kwajalein for food and supplies from 26 to 27 December 1945. They arrived at Pearl Harbor on 6 January 1946 and tied up at the Submarine Base, where a U.S. Navy band and local celebrities welcomed them. On 18 February 1946, I-400 entered drydock at Pearl Harbor for evaluation. Disposal With postwar relations with the Soviet Union deteriorating rapidly and concerns growing in the United States that under postwar agreements the Soviets would demand access to the captured Japanese submarines that would provide the Soviet Navy with valuable information about advanced Japanese submarine designs, the U.S. Navy issued orders on 26 March 1946 to sink all captured Japanese submarines. Accordingly, the U.S. Navy sank I-400 as a target in tests of the Mark 10 Mod 3 exploder off Pearl Harbor on 4 June 1946. She sank by the stern at 12:10 at after the submarine hit her with three Mark 18 Mod 2 torpedoes. Commander, Submarine Force, U.S. Pacific Fleet (COMSUBPAC), Vice Admiral Allan R. McCann, and the commander of Submarine Division 52, Commander Lawson P. Ramage, were embarked on Trumpetfish to observe the sinking of I-400. Discovery of wreck On 1 August 2013, the Hawaii Undersea Research Laboratory's (HURL) deep-diving submersible Pisces V located the wreck of southwest of Oahu, Hawaii, at a depth of . What Pisces V initially identified as the bow turned out to be a point back from the bow, and the hull was completely intact. The wreck showed signs of heavy implosion damage, however, and I-400′s entire superstructure was missing, her conning tower and aircraft hangar apparently having detached from her hull during her final descent to the ocean floor in 1946. References Bibliography Sakaida, Henry and Gary Nila, Koji Takaki. I-400: Japan's Secret