German submarine U-1233
German submarine "U-1233" was a Type IXC/40 U-boat built for Nazi Germany's "Kriegsmarine" during World War II. Design. German Type IXC/40 submarines were slightly larger than the original Type IXCs. "U-1233" had a displacement of when at the surface and while submerged. The U-boat 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 MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of for use while surfaced, two Siemens-Schuckert 2  GU 345/34 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-1233" was fitted with six torpedo tubes (four fitted at the bow and two at the stern), 22 torpedoes, one SK C/32 naval gun, 180 rounds, and a Flak M42 as well as two twin C/30 anti-aircraft guns. The  boat had a complement of forty-eight. Service history. "U-1233" was ordered in October 1941 from Deutsche Werft AG in Hamburg-Finkenwerder under the yard number 396. Her keel was laid down on 29 April 1943 and was launched on 23 December 1943. About three months later she was commissioned into service under the command of "Korvettenkapitän" Hans-Joachim Kuhn (Crew 31) in the 31st U-boat Flotilla. After completing training and work-up for deployment "U-1233" was transferred to the 33rd U-boat Flotilla for front-line service on 1 November 1944. The U-boat left Horten Naval Base  on 11 December 1944 for the first and only war patrol. After returning to Kiel, Kuhn was relieved as commander by "Oberleutnant zur See" Heinrich Niemeyer (Crew X/39) on 15 April 1945. In May 1945 "U-1233" transferred to Fredericia in order to surrender to Allied forces. En route "U-1233" and two accompanying U-boats - and - were attacked by Allied aircraft. In the course of the attack one P-51 Mustang of No. 126 Squadron RAF was shot down. In June 1945 the surrendered U-boats were transferred to Wilhelmshaven under British guard from where they sailed for Loch Ryan, a collecting  point for Operation Deadlight. On 28 December 1945 "U-1233" was towed to sea by . When the cable slipped the U-boat was sunk by artillery fire from on 29 December 1945 in position