German submarine U-988

German submarine U-988 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 2 October 1942 by Blohm & Voss, Hamburg as yard number 188, launched on 3 June 1943 and commissioned on 15 July 1943 under Oberleutnant zur See Erich Dobberstein.

History
Nazi Germany
Name	U-988
Ordered	25 May 1941
Builder	Blohm & Voss, Hamburg
Yard number	188
Laid down	2 October 1942
Launched	3 June 1943
Commissioned	15 July 1943
Fate	Sunk on 22 June 1944
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
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 (4 bow, 1 stern) 14 × torpedoes or 26 TMA mines 1 × 8.8 cm (3.46 in) deck gun (220 rounds) 1 × twin 2 cm (0.79 in) C/30 anti-aircraft gun
Service record
Part of:	5th U-boat Flotilla 15 July 1943 – 31 May 1944 7th U-boat Flotilla 1 – 22 June 1944
Identification codes:	M 53 999
Commanders:	Oblt.z.S. Erich Dobberstein[1] 15 July 1943 – 22 June 1944
Operations:	1 patrol: 22 May – 22 June 1944
Victories:	None

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-988 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-988 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 one twin 2 cm (0.79 in) C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.^[2]

Service history

U-988′s career began on 15 July 1943 with training as part of the 5th U-boat Flotilla. On 8 September 1943, she collided with U-983 in the Baltic Sea north of Loba (54°46′N 17°14′E). As a result of the collision, U-983 sank with the loss of five of her 43 crew.^[3]

U-988 began active service on 1 June 1944 as part of the 7th U-boat Flotilla.

Wolfpacks

U-988 took part in no wolfpacks.

Fate

U-988 was sunk by depth charges from a US Liberator on 22 June 1944. There were no survivors.^[4]

Previously recorded fate

U-988 sent her last radio message on 18 June, informing about an air attack, and was lost with all hands thereafter, and her fate is not certain.^[5] It is believed that U-988 attacked three ships on 27–29 June and then was sunk on 29/30 June 1944 in the English Channel west of Guernsey at 49°37′N 03°41′W at dawn by the Royal Navy frigates HMS Essington, HMS Cooke, HMS Duckworth, and HMS Domett, after being damaged by Royal Air Force Liberators of No. 244 Squadron.^[6]

Alternate fate

There appeared however a theory, that U-988 could have been sunk after an attack of Polish Wellington Mk XIV from 304 Squadron, piloted by Leopold Antoniewicz, which was credited with sinking a submarine on 18 June in the approximate position 49°03′N 04°48′W.^[5] Then, the submarine sank on 29/30 June could have been U-1191.^[5]