Actually he destroyed the torpedo room and the control room.
There’s no watertight bulkhead until you get back to the forward reactor compartment bulkhead. That, including the emergency cooling water tank, is the first place the fire could be stopped. So it would have gotten, control, torpedoe, missile tubes, electronics, officers and crews quarters, galley, battery well, ie the whole maryanne. What’s a mystery to me , since this guy was a painter/blaster, there had to be work happening, and that requires a fire watch. Where the bleep was the fire watch-——?