>>36157310Taihō's chief damage control officer eventually ordered the ship's general ventilation system switched to full capacity and, where possible, all doors and hatches opened to try to rid the ship of fumes. Unfortunately, this simply resulted in saturation of areas previously unexposed to the vapors and increased the chances of accidental or spontaneous ignition.[24][25] About 14:30 that afternoon, 6½ hours after the initial torpedo hit, Taihō was jolted by a severe explosion. A senior staff officer on the bridge saw the flight deck heave up. The sides blew out. Taihō dropped out of formation and began to settle in the water, clearly doomed. Though Admiral Ozawa wanted to go down with the ship, his staff prevailed on him to survive and to transfer his flag to the cruiser Haguro. Taking the Emperor's portrait, Ozawa transferred to Haguro by destroyer. After he left, Taihō was torn by a second thunderous explosion and sank stern first at 16:28, taking 1,650 officers and men out of a complement of 2,150 down with her
tl:dr:
she had a gas leak 
