The Admiralty later concluded that the most likely explanation for the loss of "Hood" was a penetration of her magazines by a shell from "Bismarck", causing the explosion. Recent research with submersible craft suggests that the initial explosion was in the aft magazine and that it spread to the magazines via the ammunition trunks. It has been suggested from examination of the wreckage, found in 2001, that the magazine explosion in the armament near the mainmast caused the vertical blast of flame seen there, and this in turn ignited the magazines of the aft guns that caused the explosion that wrecked the stern. This explosion might have travelled through the starboard fuel tanks, igniting the fuel oil there, setting off the forward magazines and completing the destruction of the ship.