Sunk without trace in what some historians consider the greatest naval battle ever fought, the mightiest battleship ever built has been found off the Philippines by one of the world’s wealthiest men. Paul Allen, the multibillionaire Microsoft co-founder, on Tuesday posted photographs of the wreck of the Musashi, a second world war Japanese battleship that, with its sister-ship the Yamato, was the largest and most heavily-armed warship ever launched. “WW2 Battleship Musashi sank 1944 is FOUND,” Allen announced on Twitter, beneath a ghostly underwater photograph of the mammoth vessel’s rusting, coral-encrusted bow clearly bearing the chrysanthemum crest of the Japanese...