German submarine U-47 was a Type VIIB U-boat of the German Kriegsmarine  during World War II. She was laid down on 25 February 1937 at Krupp Germaniawerft in Kiel and went into service on 17 December 1938 under the command of Günther Prien.

During U-47's career with the Kriegsmarine, she sank a total of 31 enemy vessels and damaged 8 more. U-47 is also noted for the sinking of the British battleship HMS Royal Oak on 14 October 1939. U-47 ranks as one of the most successful German U-boat of World War II.

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