Since she capsized, Musashi's main gun turrets most likely fell out of their mounts; the expedition did film one empty turret hole. Was there report of a massive explosion when she sank like what happened to Yamato? If so, the Big M would have broken up like the Big Y did. If not, she may have sunk relatively intact.
Canadian lighthouse to U.S. Warship approaching it: "This is a lighthouse. Your call!"