German submarine U-456 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II.She was laid down on 3 September 1940 by Deutsche Werke in Kiel as yard number 287, launched on 21 June 1941 and commissioned on 18 September 1941 under Kapitänleutnant Max-Martin Teichert (Knight's Cross).