Title: Hearts of Oak
Subjects: Submarine, Survival after airplane accidents, shipwrecks, World War, 1939-1945, Royal Oak (Battleship), Naval operations, History, German Naval operations, Shipwreck survival, World war, 1939-1945, naval operations, submarine, World war, 1939-1945, naval operations, german, Survival after airplane accidents, shipwrecks, etc., Scotland, history
Places: Scotland, Scapa Flow
Time periods: 20th century