German submarine U-251 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 18 October 1940 at the Bremer-Vulkan-Vegesacker Werft (yard) in Bremen as yard number 16, launched on 26 July 1941 and commissioned on 20 September under the command of Kapitänleutnant Heinrich Timm.
In ten patrols, she sank two ships of . She was a member of three wolfpacks.
She was sunk by British and Norwegian aircraft in the Kattegat on 19 April 1945.
The U-251 can be seen on YouTube video 'Diving on Nazi submarine U-251'.[1]
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-251 had a displacement of 769t when at the surface and 871t while submerged. She had a total length of 67.1m (220.1feet), a pressure hull length of 50.5m (165.7feet), a beam of 6.2m (20.3feet), a height of 9.6m (31.5feet), and a draught of 4.74m (15.55feet). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of NaNPS for use while surfaced, two AEG GU 460/8–27 double-acting electric motors producing a total of 750PS for use while submerged. She had two shafts and two 1.23abbr=onNaNabbr=on 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-251 was fitted with five 53.30NaN0 torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.82NaN2 SK C/35 naval gun, 220 rounds, and two twin 2sp=usNaNsp=us C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.
After training with the 6th U-boat Flotilla, she became operational on 1 May 1942. U-245 was transferred to the 11th flotilla on 1 July and the 13th flotilla on 1 June 1943. There followed spells with the 24th, 21st and 31st flotillas, (see infobox for dates).
The boat's first patrol was preceded by a short trip between Kiel and Kristiansand in Norway. Her first sortie proper began with her departure from Kristiansand on 20 April 1942. The second part of this patrol was marked by sinking the Jutland south of Bear Island on 3 May after the ship had been hit by bombs from German aircraft. She then made three forays from Kirkenes, Skjomenfjord and Trondheim over the rest of May.
Her second patrol was also in May and covered the eastern Norwegian Sea.
The submarine sank the El Capitan on 17 July 1942 near northeast Iceland. This ship was with Convoy PQ 17 before being attacked by Luftwaffe Ju 88s. The ship had been abandoned; U-251 finished her off.
For the rest of her career, the U-boat patrolled northern waters; at one time steaming as far north and east as Novaya Zemlya in the Kara Sea.
By the time of her tenth sortie, the Allies dominated the air. This situation was dramatically demonstrated when the boat was sunk by rockets from no less than eight British and Norwegian Mosquitos of 143, 235 and 248 squadrons in the Kattegat on 19 April 1945.
Thirty-nine men died; there were four survivors.
U-251 took part in three wolfpacks, namely:
| Date | Ship Name | Nationality | Tonnage (GRT) | Fate[2] | |
|---|---|---|---|---|---|
| 3 May 1942 | Jutland |  United Kingdom | 6,153 | Sunk | |
| 10 July 1942 | El Capitan |  Panama | 5,255 | Sunk |