The Musashi went down in an American aerial assault during the Battle of Leyte Gulf, the largest naval engagement ever.
And then — nothing. The wreckage was never found. The remains of the Yamato were discovered in the South China Sea in 1984, but the Musashi, despite sinking in a well-documented battle and in front of thousands of witnesses, eluded every search. It seemed to have just vanished.
Or it did until last week, when Paul Allen started tweeting.