The true story of the loss of submarine HMS Thetis is still shrouded in mystery, even now, some seventy-five years after her tragic sinking. On 1 June 1939, HMS Thetis sank in Liverpool Bay on her maiden dive with the loss of ninety-nine lives. It was the worst peacetime submarine tragedy ever to be suffered by the Royal Navy. As soon as the impending disaster was reported, a massive rescue operation was mounted by the Royal Navy, but following a...