On October 24, 1944, the world's greatest naval battle began in the Philippines. The Japanese navy gambled on a decisive victory over the United States to reverse the situation in the Second World War. In its place was the Musashi, its top secret super battleship, which eventually sank to the bottom of the sea. How did this unsinkable giant fall so quickly? Is it the overwhelming American air power? Or a fatal design flaw? Now, American deep-sea explorers and Japanese military experts are determined to unravel this 70 year old mystery. But first they must find the missing Musashi.