German submarine U-398
German submarine "U-398" was a Type VIIC U-boat built for Nazi Germany's "Kriegsmarine" for service during World War II. The U-boat was laid down at the Howaldtswerke in Kiel on 26 August 1942, launched on 6 November 1943 and commissioned on 18 December of that same year, under "Korvettenkapitän" Johan Reckhoff. He was replaced by "Oberleutnant zur See" Wilhelm Kranz on 8 November 1944. The boat served initially with the 5th U-boat Flotilla, a training organization, between 18 December 1943 and 31 July 1944, before moving over to the operational 3rd flotilla between  1 August and 31 October 1944 and the 33rd flotilla between 1 November 1944 and her loss. Design. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-398" had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two Garbe, Lahmeyer & Co. RP 137/c double-acting electric motors producing a total  of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to . The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . "U-398" was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one SK C/35 naval gun, (220 rounds), one Flak M42 and two twin C/30 anti-aircraft guns. *The commissioning of an unknown refit to the external shell and restructuring of  internal cabin facilities before her final voyage has been rumoured, but German naval records haven't confirmed this. The boat had a complement of between forty-four and sixty. Service history. "U-398" carried out two patrols, the first, commencing on 23 August 1944, took her as far as the west coast of Ireland; starting from Horten Naval Base in Norway and finishing with her arrival in Bergen on 15 October. A total of 54 days were spent at sea. These were uneventful. Her second patrol ended abruptly after just four days in April 1945. She vanished without trace in either  the North Sea or possibly the Arctic Ocean. The cause for her disappearance remains unknown.