Sinking the battleship HMS Royal Oak in the Royal Navys home anchorage with the loss of more than 800 of her crew was Germanys first shattering blow against Britain in the 1939-45 war. Within six weeks the long-standing German dream of breaching the defences of Scapa Flow had been achieved. Germany claimed the sinking for the submarine U-47 commanded by Lt. Gunther Prien. Prien & his crew became instant folk heroes lauded interviewed & exploited to extract the maximum glory from their deed. A few months later Priens autobiography Mein Weg Nach Scapa Flow" was published & sold an astonishing 750 000 copies. However there are also Royal Oak survivors who while accepting that their ship was torpedoed say: Prien & his crew cant ever have seen the inside of Scapa Flow because Priens story is almost totally at variance with the truth. Four books & dozens of articles have been written on what is now generally accepted as one of the greatest submarine exploits of all time. Yet nobody has managed to sift fact from falsehood & reconcile the apparently irreconcilable German & British stories. The author has interviewed Royal Oak survivors members of U-47s 1939 crew Lt. Priens widow & members of the firm which published his autobiography. His quest for the truth led through England Northern Ireland Wales Scotland Orkney Norway West Berlin Cologne Freiburg & even distant Amman. He has patiently investigated every point of controversy until he was able to set down a documented definitive account of the Royal Oak naval disaster. It was previously published by Cressrelles Ltd."