In the dying hours of the Third Reich Adolf Hitler gives his last orders To Reichleiter Martin Bormann he entrusts a sealed case Inside are explosive documents to ensure National Socialism's survival through a worldwide network of Nazi sympathisers In the Caribbean, a diver discovers a German U-Boat resting on a remote reef, uncovered from its fifty-year grave by a recent storm The diver recovers the captain's log, but behind sealed watertight doors another case remains on board When the British Secret Service get wind of the discovery they take drastic action to locate the submarine and salvage the documents before they fall into the wrong hands