German submarine U-956 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II.She was laid down on 20 February 1942 by Blohm & Voss, Hamburg as yard number 156, launched on 14 November 1942 and commissioned on 6 January 1943 under Oberleutnant zur See Hans-Dieter Mohs.