German submarine U-604

German submarine U-604 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 27 February 1941 by Blohm & Voss in Hamburg as yard number 580, launched on 16 November 1941 and commissioned on 8 January 1942 under Kapitänleutnant Horst Höltring (German Cross in Gold).

History
Nazi Germany
Name	U-604
Ordered	22 May 1940
Builder	Blohm & Voss, Hamburg
Yard number	580
Laid down	27 February 1941
Launched	16 November 1941
Commissioned	8 January 1942
Fate	Scuttled on 11 August 1943 at position 04°30′S 21°20′W in the South Atlantic after being depth charged by two US aircraft, a Ventura and a Liberator.
General characteristics
Class & 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) 1 x 2 cm (0.79 in) C/30 AA gun
Service record[1]
Part of:	5th U-boat Flotilla 8 January – 31 July 1942 9th U-boat Flotilla 1 August 1942 – 11 August 1943
Identification codes:	M 27 582
Commanders:	Kptlt. Horst Höltring 8 January 1942 – 11 August 1943
Operations:	6 patrols: 1st patrol: 4 August – 8 September 1942 2nd patrol: 14 October – 5 November 1942 3rd patrol: 26 November – 31 December 1942 4th patrol: 8 February – 9 March 1943 5th patrol: 22 – 26 April 1943 6th patrol: 24 June – 11 August 1943
Victories:	6 merchant ships sunk (39,891 GRT)

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-604 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged.^[2] 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 Brown, Boveri & Cie GG UB 720/8 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).^[2]

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).^[2] 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-604 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 a 2 cm (0.79 in) C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.^[2]

Service history

The boat's service began on 8 January 1942 for training as part of the 5th U-boat Flotilla. After training was completed she transferred to the 9th flotilla on 1 August 1942 for active service.

In 6 patrols she sank 6 ships for a total of 39,891 gross register tons (GRT).

Wolfpacks

U-604 under attack of the VB-129.

She took part in five wolfpacks, namely:

• Vorwärts (25 August – 1 September 1942)
• Streitaxt (20 – 31 October 1942)
• Draufgänger (1 – 11 December 1942)
• Ungestüm (11 – 22 December 1942)
• Knappen (19 – 25 February 1943)

Fate

She was scuttled on 11 August 1943 at position 04°30′S 21°20′W in the South Atlantic after being depth charged by two US aircraft, a Ventura and a Liberator. Her crew was rescued by U-185.

Summary of raiding history

Date	Ship Name	Nationality	Tonnage (GRT)	Fate[3]
25 August 1942	Abbekerk	Netherlands	7,906	Sunk
27 October 1942	Anglo Maersk	United Kingdom	7,705	Sunk
30 October 1942	Président Doumer	United Kingdom	11,898	Sunk
30 October 1942	Baron Vernon	United Kingdom	3,642	Sunk
2 December 1942	Coamo	United States	7,057	Sunk
23 February 1943	Stockport	United Kingdom	1,683	Sunk