It would certainly be interesting to see how the torpedo protection system fared. In a book on Axis battleships, (by Friedman, IIRC), it stated that the design of the torpedo protection was insufficient for the Yamato class. Personally, I doubt if any system could have been effective against the aerial onslaught unleashed on the Yamatos, but then again, a survey of wrecks has revealed some surprises, such as the finding that the Bismarck's armor was essentially intact, lending credence to survivor's tales that the ship sank because she was scuttled, not because of damage from British shells and torpedoes. Yes, the upperworks were battered horribly, but the armored raft was basically intact. While I doubt the same can be said for Musashi, there are undoubtedly surprises we would find, and that can be done without disturbing it as a grave site.