 German submarine U-3503

German submarine "U-3503" was a Type XXI U-boat (one of the ""Elektroboote"") of Nazi Germany's "Kriegsmarine", built for service in World War II.She was ordered on 6 November 1943, and was laid down on 17 June 1944 at F Schichau GmbH, Danzig, as yard number 1648.