U-251 in Narvik in July 1942
History
Nazi Germany
Name	U-251
Ordered	23 September 1939
Builder	Bremer Vulkan-Vegesacker Werft, Bremen
Yard number	16
Laid down	18 October 1940
Launched	26 July 1941
Commissioned	20 September 1941
Fate	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[1][2]
General characteristics
Class and type	Type VIIC submarine
Displacement	769 tonnes (757 long tons) surfaced 871 t (857 long tons) submerged
Length	67.10 m (220 ft 2 in) o/a 50.50 m (165 ft 8 in) pressure hull
Beam	6.20 m (20 ft 4 in) o/a 4.70 m (15 ft 5 in) pressure hull
Height	9.60 m (31 ft 6 in)
Draught	4.74 m (15 ft 7 in)
Installed power	2,800–3,200 PS (2,100–2,400 kW; 2,800–3,200 bhp) (diesels) 750 PS (550 kW; 740 shp) (electric)
Propulsion	2 shafts 2 × diesel engines 2 × electric motors
Speed	17.7 knots (32.8 km/h; 20.4 mph) surfaced 7.6 knots (14.1 km/h; 8.7 mph) submerged
Range	8,500 nmi (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph) surfaced 80 nmi (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	230 m (750 ft) Crush depth: 250–295 m (820–968 ft)
Complement	4 officers, 40–56 enlisted
Armament	5 × 53.3 cm (21 in) torpedo tubes (four bow, one stern) 14 × torpedoes or 26 TMA mines 1 × 8.8 cm (3.46 in) deck gun(220 rounds) 2 × twin 2 cm (0.79 in) C/30 anti-aircraft guns
Service record[3][4]
Part of:	6th U-boat Flotilla 20 September 1941 – 30 June 1942 11th U-boat Flotilla 1 July 1942 – 31 May 1943 13th U-boat Flotilla 1 – 30 June 1943 24th U-boat Flotilla 1 July – 30 November 1943 21st U-boat Flotilla 1 December 1943 – 28 February 1945 31st U-boat Flotilla 1 March – 19 April 1945
Identification codes:	M 15 758
Commanders:	Kptlt. Heinrich Timm 20 September 1941 – 1 September 1943 Oblt.z.S. Franz Sack 23 November 1943 – 19 April 1945
Operations:	10 patrols: 1st patrol: a. 20 – 25 April 1942 b. 29 April – 7 May 1942 c. 9 – 13 May 1942 d. 15 – 17 May 1942 e. 22 – 24 May 1942 2nd patrol: 26 – 29 May 1942 3rd patrol: a. 7 June – 5 July 1942 b. 6 – 15 July 1942 4th patrol: a. 14 August 1942 b. 15 Aug – 13 September 1942 5th patrol: 14 September – 3 October 1942 6th patrol: 14 February – 1 March 1943 7th patrol: a. 18 March – 21 April 1943 b. 8 – 10 May 1943 8th patrol: 12 – 29 May 1943 9th patrol: 13 – 24 June 1943 10th patrol: 16 – 19 April 1945
Victories:	2 merchant ships sunk (11,408 GRT)

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.^[3]

In ten patrols, she sank two ships of 11,408 gross register tons (GRT). She was a member of three wolfpacks.

She was sunk by British and Norwegian aircraft in the Kattegat of the Danish Island of Anholt on 19 April 1945.

The U-251 can be seen on YouTube video 'Diving on Nazi submarine U-251'.^[5]

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-251 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged.^[6] She had a total length of 67.10 m (220 ft 2 in), a pressure hull length of 50.50 m (165 ft 8 in), a beam of 6.20 m (20 ft 4 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two AEG GU 460/8–27 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).^[6]

The submarine had a maximum surface speed of 17.7 knots (32.8 km/h; 20.4 mph) and a maximum submerged speed of 7.6 knots (14.1 km/h; 8.7 mph).^[6] When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph). U-251 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and two twin 2 cm (0.79 in) C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.^[6]

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,^[3] (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:

• Strauchritter (29 April – 5 May 1942)
• Eisteufel (21 June – 12 July 1942)
• Eisbär (27 March – 15 April 1943)

Date	Ship Name	Nationality	Tonnage (GRT)	Fate[7]
3 May 1942	Jutland	United Kingdom	6,153	Sunk
10 July 1942	El Capitan	Panama	5,255	Sunk

• Helgason, Guðmundur. "The Type VIIC boat U-251". German U-boats of WWII – uboat.net. Retrieved 26 December 2014.
• Hofmann, Markus. "U 251". Deutsche U-Boote 1935-1945 – u-boot-archiv.de (in German). Retrieved 26 December 2014.