Captain Prien and crew of German submarine U-47 greeted on return to Kiel, after sinking the British battleship, Royal Oak

Views of the British battleship Royal Oak, in Scapa Flow, Scotland, and underway at sea. . The German submarine, U-47, commanded by Captain Gunter Prien, underway and saluting as they are greeted as they return to base at Kiel, Germany, on October 23, 1939, after successfully penetrating Scapa Flow and torpedoing the British battleship, Royal Oak (and also, the British battle cruiser, Repulse, they believed), on October 14, 1939.