The fire took out the torpedo room but during a major overhaul, let alone being in dry dock, there is no ammo onboard. Actually if you want to worry about worst case scenarios with munitions, a major overhaul is the “best” time for a vessel to have a fire.
True and a shipyard is a likely place for a fire unfortunately. When we went into the yards we had a T.A.D. Fire Dept. {understandably that's not possible on subs or smaller ships}. The division later became full time even at sea and maintained all fire stations and hatches etc. Our job was to do walk throughs in all accessible spaces looking for hazards etc. We also answered the Fire Bell.
The worse fire I saw in my time onboard ship was in the yards and me and a guy in my shop {both of us were T.A.D. FD also} had discovered it. It was basically a rags and cardboard fire best I recall. The duty team took the fire and we did OBA investigations on surrounding compartments. The fire was off the hanger bay. The heat transfer from it was on the 02 level two decks up. You better believe we had questions to answer after the fire was out. That space was one I reckon nobody had checked due to a pad lock on the hatch.