German submarine U-753
|Career (Nazi Germany)|
9 October 1939
|Laid down:||3 January 1940|
|Launched:||26 April 1941|
|Commissioned:||18 June 1941|
|Status:||Destroyed 13 May 1943 by British and Canadian depth charges|
|Type:||Type VIIC submarine|
|Displacement:||769 tonnes (757 long tons) surfaced
871 t (857 long tons) submerged
|Length:||67.1 m (220 ft 2 in) o/a
50.5 m (165 ft 8 in) pressure hull
|Beam:||6.2 m (20 ft 4 in) o/a
4.7 m (15 ft 5 in) pressure hull
|Draft:||4.74 m (15 ft 7 in)|
|Propulsion:||2 × supercharged Germaniawerft 6-cylinder 4-stroke F46 diesel engines, totalling 2,800–3,200 bhp (2,100–2,400 kW). Max rpm: 470-490
2 × GL RP 137/c electric motors, totalling 750 shp (560 kW) and max rpm: 296
|Speed:||17.7 knots (32.8 km/h; 20.4 mph) surfaced
7.6 knots (14.1 km/h; 8.7 mph) submerged
|Range:||15,170 km (8,190 nmi) at 10 knots (19 km/h; 12 mph) surfaced
150 km (81 nmi) 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:||44–52 officers & ratings|
|Armament:||5 × 53.3 cm (21 in) torpedo tubes (4 bow, 1 stern)
14 × torpedoes or 26 TMA mines
1 × 8.8 cm (3.46 in) deck gun (220 rounds)
Various AA guns
3rd U-boat Flotilla (Front Boat, 7 patrols)
1 Dec 1941 – 13 May 1943
|Commanders:||FrgKpt. Alfred Manhardt von Mannstein
18 Jun 1941 – 13 May 1943
|Victories:||3 ships sunk for a total of 23,117 gross register tons (GRT)
2 ships damaged 6,908 gross register tons (GRT)
German submarine U-753 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. Commissioned on 18 June 1941, she served with 3rd U-boat Flotilla until 30 November as a training boat, and as a front boat until 13 May 1943 under the command of Alfred Manhardt von Mannstein.
On her sixty-five day fourth Patrol, U-753 sank two vessels and damaging a further two in the West Indies. Her first victim was twenty-eight days into her voyage, an American merchant vessel, the George Calvert on 20 May 1942. George Calvert was destroyed by three torpedoes off the coast of Cuba, killing three of her fifty-one man crew.
Two days later, E.P. Theriault, a British sailing ship, was attacked by U-753. She did not sink, however, and was taken back to Cuba and repaired. On the morning of the 25th of May, the Norwegian tanker Haakon Hauan was hit by one of U-753's torpedoes. This vessel also survived and was repaired.  The Norwegian tanker Hamlet, however, did not escape when she encountered the U-boat two days later. Three torpedoes were fired between eleven o'clock and noon. All thirty-six crewmembers survived the sinking and were rescued by nearby fishing boats.  
U-753's sixth patrol had her patrolling the North Atlantic, on the European side. Twenty-five days into her forty-two day voyage on 22 February, U-753 found the ON-166 convoy in the mid-Atlantic, her target: the Norwegian Whale ship N.T. Nielsen-Alonso. The vessel had in fact been abandoned earlier that day after an attack from U-92. U-753 fired two coups de grâce and one torpedo at the ship, failing to sink it. The submarine was forced to leave after a Corvette took notice. 
U-753 set off on her seventh and final patrol on 5 May 1943. Nine days in, she was discovered 10 nautical miles (19 km) away from convoy HX 237 by a Sunderland aircraft of No. 423 Squadron RCAF. After a twenty-minute exchange of fire with the aircraft, U-753 dove when the corvette HMCS Drumheller joined the engagement. The aircraft dropped two depth charges immediately after. An aircraft from the escort carrier Biter marked the location of the Submarine with smoke flares. HMS Lagan caught up to the Drumheller and the two dropped depth charges, finally sinking U-753, all 47 crewmen were lost at sea. 
Summary of Raiding Career
|20 May 1942||George Calvert||United States||7,191||Sunk|
|22 May 1942||E.P.Theriault||United Kingdom||326||Damaged|
|25 May 1942||Haakon Hauan||Norway||6,582||Damaged|
|27 May 1942||Hamlet||Norway||6,578||Sunk|
|22 February 1943||N.T.Nielsen-Alonso||Norway||9,348||Sunk|
- "Uboat.net source". Uboat Encyclopedia. Uboat.net. Retrieved 2009-09-10.
- "Uboat.net source (George Calvert)". Uboat Encyclopedia. Uboat.net. Retrieved 2009-09-11.
- "Uboat.net source (E.P. Theriault)". Uboat Encyclopedia. Uboat.net. Retrieved 2009-09-11.
- "Uboat.net source (Haakon Hauan)". Uboat Encyclopedia. Uboat.net. Retrieved 2009-09-11.
- "Uboat.net source (Hamlet)". Uboat Encyclopedia. Uboat.net. Retrieved 2009-09-11.
- "Warsailors (George Calvert)". Naval Encyclopedia. warsailors.com. Retrieved 2009-09-11.
- "Uboat.net (N.T. Nielsen-Alonso)". Uboat Encyclopedia. uboat.com. Retrieved 2009-09-11.
- "Uboat.net (U-753 patrol report)". Uboat Encyclopedia. uboat.com. Retrieved 2009-09-11.