German submarine U-1023

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The U-1023 in Plymouth harbour, May 1945
The U-1023 in Plymouth harbour, May 1945
Career (Nazi Germany)
Name: U-1023
Ordered: 13 June 1942 [1]
Builder: Blohm & Voss, Hamburg [1]
Yard number: 223 [1]
Laid down: 20 May 1943 [1]
Launched: 3 May 1944 [1]
Commissioned: 15 June 1944 [1]
Fate: Surrendered to Allies at Weymouth [1]
General characteristics
Class and type: Type VIIC/41 submarine
Displacement: 759 tonnes (747 long tons) surfaced
860 t (846 long tons) submerged
Length: 67.10 m (220 ft 2 in) o/a
50.5 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
Draft: 4.74 m (15 ft 7 in)
Propulsion: 2 × supercharged Germaniawerft 6-cylinder, 4-stroke F46 diesel engines totalling 2,800–3,200 hp (2,100–2,400 kW). Max rpm: 470-490
2 × 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: 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)
Calculated crush depth: 250–295 m (820–968 ft)
Complement: 44-52 officers & ratings
Service record
Part of:

Kriegsmarine 31st U-boat Flotilla (Training), 16 September 1943–31 May 1944

11th U-boat Flotilla (Front Boat), 1 March 1945–10 May 1945 [1]

Oberleutnant zur See Wolfgang Strenger, 15 June 1944–9 March 1945

Kapitänleutnant Heinrich Schroeteler, 10 March 1945–10 May 1945[1]
Operations: 1 patrol[1]

1 warship sunk for 335 gross register tons (GRT)

1 ship damaged for 7,345 GRT[1]

German submarine U-1023 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine. She was laid down on 20 May 1943 by Blohm & Voss in Hamburg, Germany, and commissioned on 15 June 1944 with Oberleutnant Wolfgang Strenger in command. U-1023 sank one ship and damaged one more for a total of 7,680 GRT. After the war she was sunk in Operation Deadlight.

Construction and design[edit]

U-1023 was ordered by the Kriegsmarine on 13 June 1942. She was laid down about one year later at Blohm & Voss, Hamburg on 20 May 1943. Almost a year later, U-1023 was launched from Hamburg on 3 May 1944. She was formally commissioned later that year on 15 July. U-1023 carried 5 × 53.3 cm (21 in) torpedo tubes (4 located in the bow, 1 in the stern) and had one 8.8 cm (3.46 in) deck gun with 220 rounds. She could also carry 14 G7e torpedoes or 26 TMA mines and had a crew of 44–52 men. She was one of the U-boats that used the Schnorchel underwater breathing apparatus.[1]

Service History[edit]

After her redesignation as a front-line U-boat, U-1023 left port on her first and only patrol. By that time, she had moved from Kiel to her current location in Bergen via a stopover in Horten on two minor patrols. After she left on her first patrol, U-1023 intercepted the Riverton, a 7,345 tonnes (7,229 long tons) British steam merchant. She was damaged and beached off of St. Ives Bay. Later, U-1023 found the 335 ton Norwegian minesweeper NYMS 382, which was sunk with 22 dead.


Three days later, the ship surrendered at Weymouth, England.[2] After the war she was paraded up the west coast of the UK visiting a number of ports including: Plymouth, Brixham, Falmouth, Bristol, Swansea, Liverpool, Holyhead, Manchester, Fleetwood, Belfast, Glasgow, Greenock, Rothsay, Oban. Several hundred thousand visitors were given a tour of the boat during this time.[3] U-1023 was then used in Operation Deadlight and sunk by the Allies.[1]

Summary of raiding career[edit]

Date Ship Name Nationality Tonnage (GRT) Fate[4]
23 April 1945 Riverton  United Kingdom 7,345 Damaged
7 May 1945 HNoMS NYMS-382  Royal Norwegian Navy 335 Sunk


FLAK weaponry[edit]

U-1023 was mounted with a single 3.7 cm Flakzwilling M43U gun on the rare LM 43U mount. The LM 43U mount was the final design of mount used on U-boats and is only known to be installed on U-boats (U-249, U-826, U-1171, U-1305 and U-1306). The 3.7 cm Flak M42U was the marine version of the 3.7 cm Flak used by the Kriegsmarine on Type VII and Type IX U-boats.

See also[edit]


  1. ^ a b c d e f g h i j k l m Helgason, Guðmundur. "U-1023". German U-boats of WWII - Retrieved 31 May 2010. 
  2. ^ Helgason, Guðmundur. "Patrol of U-boat U-1023 from 1 March 1945 to 10 May 1945". German U-boats of WWII - Retrieved 31 May 2010. 
  3. ^ My Grandfather Bob Brown who was Chief engineer on board during the tour.
  4. ^ Helgason, Guðmundur. "U-1023". German U-boats of WWII - Retrieved 17 February 2014. 


  • Gröner, Erich (1985). U-Boote, Hilfskreuzer, Minenschiffe, Netzleger, Sperrbrecher. Die deutschen Kriegsschiffe 1815-1945 (in German) III (Koblenz: Bernard & Graefe). ISBN 3-7637-4802-4. 
  • Busch, Rainer; Röll, Hans-Joachim (1999). Deutsche U-Boot-Verluste von September 1939 bis Mai 1945. Der U-Boot-Krieg (in German) IV (Hamburg; Berlin; Bonn: Mittler). ISBN 3-8132-0514-2. 

External links[edit]