enriched uranium (about half of the world's supply of uranium-235 at the time) and other parts required for the assembly of the atomic bomb codenamed "Little Boy", which would be dropped on Hiroshima a few weeks later. Indianapolis departed San Francisco's Hunters Point Naval Shipyard on 16 July 1945, within hours of the Trinity test. She set a speed record of hours from San Francisco to Pearl Harbor, an average speed of . Arriving at Pearl Harbor on 19 July, she raced on unaccompanied, delivering the atomic bomb components to Tinian on 26 July. Indianapolis was then sent to Guam, where a number of the crew who had completed their tours of duty were relieved by other sailors. Leaving Guam on 28 July, she began sailing toward Leyte, where her crew was to receive training before continuing on to Okinawa to join Vice Admiral Jesse B. Oldendorf's Task Force 95. Sinking At 00:15 on 30 July 1945, Indianapolis was struck on her starboard side by two Type 95 torpedoes, one in the bow and one amidships, from the Japanese submarine , captained by Commander Mochitsura Hashimoto, who initially thought he had spotted the . The explosions caused massive damage. Indianapolis took on a heavy list (the ship had had a great deal of armament and gun-firing directors added as the war went on, and was therefore top-heavy) and settled by the bow. Twelve minutes later, she rolled completely over, then her stern rose into the air and she sank. Some 300 of the 1,195 crewmen aboard went down with the ship. With few lifeboats and many without life jackets, the remainder of the crew was set adrift. Rescue Navy command did not know of the ship's sinking until survivors were spotted in the open ocean three and a half days later. At 10:25 on 2 August, a PV-1 Ventura flown by Lieutenant Wilbur "Chuck" Gwinn and his copilot, Lieutenant Warren Colwell, and a PBY-2 Catalina piloted by Bill Kitchen spotted the men adrift while on a routine patrol flight. Gwinn immediately dropped a life raft and radio transmitter. All air and surface units capable of rescue operations were dispatched to the scene at once. First to arrive was an amphibious PBY-5A Catalina patrol plane flown by Lieutenant Commander (USN) Robert Adrian Marks. Marks and his flight crew spotted the survivors and dropped life rafts; one raft was destroyed by the