External explosion on the port side, just behind the tower.
WTF happened to the Bofors?
I was wondering the same thing...secondary ammunition explosion, maybe?
Ship was sunk by an explosion low and aft of midships, near or under the engine room. It sunk, rolled over and went down with the hull high up when it struck the bottom. (See the crushed superstructure flattened by the ship’s weight: a flattened squished surface, but no explosive damage.)
The fiberglass Bofors gun casing was likewise cracked open by a rock sticking up from the bottom (or the bottom itself) like an eggshell would be cracked between a flat book and a countertop.
May their gods have mercy on the sailor’s souls.