Armed with new deep diving technology, a British military expedition set out to explore the site of one of Britain's greatest maritime disasters: the sinking of HMS Prince of Wales and Repulse in December 1941.Their evidence may provide answers to the disaster's central mystery: how two state of the art battleships were sunk in less than ninety minutes by Japanese air attack alone. Their investigation provides the spine to the historical story of Churchill's decision to send two battleships as the sole deterrent to Japan's ambition for war.