At 00:15 on 30 July, Indianapolis was struck on her starboard side by two Type 95 torpedoes, one in the bow and one amidships, from the Japanese submarine I-58,[1] captained by Commander Mochitsura Hashimoto, who initially thought he had spotted the New Mexico-class battleship Idaho.[22] 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)[23] and settled by the bow. Twelve minutes later, she rolled completely over, then her stern rose into the air, and she plunged down.