German submarine Hai (S 170)

German submarine Hai, the former U-2365 Type XXIII U-boat of Nazi Germany's Kriegsmarine during World War II, was one of the first submarines of the Bundesmarine. She was ordered on 20 September 1944, and was laid down on 6 December 1944 at Deutsche Werft AG, Hamburg, as yard number 519. She was launched on 26 January 1945 and commissioned under the command of Oberleutnant zur See Fritz-Otto Korfmann on 2 March 1945. Scuttled in 1945, the boat was raised in 1956 and commissioned into the newly-founded Bundesmarine as Hai, were she served until she sank by accident in 1966.

Design
Like all Type XXIII U-boats, U-2365 had a displacement of 234 t when at the surface and 258 t while submerged. She had a total length of 34.68 m (o/a), a beam width of 3.02 m (o/a), and a draught depth of3.66 m. The submarine was powered by one MWM six-cylinder RS134S diesel engine providing 575 - 630 PS, one AEG GU4463-8 double-acting electric motor electric motor providing 580 PS, and one BBC silent running CCR188 electric motor providing 35 PS.

The submarine had a maximum surface speed of 9.7 kn and a submerged speed of 12.5 kn. When submerged, the boat could operate at 4 kn for 194 nmi; when surfaced, she could travel 2600 nmi at 8 kn. U-2365 was fitted with two 53.3 cm torpedo tubes in the bow. She could carry two preloaded torpedoes. The complement was 14 – 18 men. This class of U-boat did not carry a deck gun.

Service history
On 8 May 1945, U-2365 was scuttled northwest of Anholt in the Kattegat as part of Operation Regenbogen. The wreck was originally located at 56.85°N, 11.81667°W.

Post war service
In June of 1956, U-2365 was raised by the German Federal Navy and commissioned U-Hai on 15 August 1957. On 14 September 1966, she foundered on Dogger Bank in the North Sea during a gale. Nineteen of the twenty crewmen were lost, making this one of the worst peacetime naval disasters in German history. She was raised on 19 September 1966 from 47 m of water and broken up.

The wreck was originally located at 55.25°N, 4.36667°W.