The Sinking of the Royal Oak (14 October 1939)

This video considers the sinking of the Royal Oak at Scapa Flow by German U-Boat U-47, commaned by Gunther Prien.
Additional Reading:
Antony Beevor, "The Second World War"
Winston Churchill, "Their Finest Hour"
James Holland, "The Rise of German, 1939-1941: The War in the West"
Lawrence Patterson, "The U-Boat War: A Global History, 1939-1945"
Philips Payson O'Brien, "How the War was Won"
Andrew Roberts, "The Storm of War"
Dilip Sarkar, "Faces of HMS Royal Oak: The 'Mighty Oak' Disaster at Scapa Flow"