Shortly after 15:25, and without warning, a series of violent explosions tore through the rear part of the ship. She capsized five minutes later. Some thought that she had been torpedoed by a German U-boat or detonated a submarine-laid mine, but examination of the wreckage revealed that the explosions were internal. The divers sent to investigate the ship reported that the explosions began in either the rear 9.2-inch shellroom or the 3-pounder and small arms magazine. The Admiralty court-martial into the causes of her loss concluded that it was caused by an internal ammunition explosion, possibly due to faulty cordite. The Admiralty issued a revised list of the dead and missing that totaled 390 in January 1916, but did not list the women and children on board that day. Losses are listed from 390 to 421.