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German submarine U-1230
Career (Nazi Germany)
Name: U-1230
Ordered: 14 October 1941
Builder: Deutsche Werft, Hamburg
Yard number: Werk 397
Laid down: 15 March 1943
Launched: 8 November 1943
Commissioned: 26 January 1944
Fate: Surrendered, 8 May 1945
General characteristics
Type: Type IXC/40 U-boat
Displacement: 1,120 t (1,100 long tons) surfaced
1,232 t (1,213 long tons) submerged
Length: 76.8 m (252 ft) overall
58.7 m (192 ft 7 in) pressure hull
Beam: 6.9 m (22 ft 8 in) overall
4.4 m (14 ft 5 in) pressure hull
Height: 9.6 m (31 ft 6 in)
Draft: 4.7 m (15 ft 5 in)
Propulsion: 2 × MAN M9V40/46 supercharged 9-cylinder diesel engines, 4,400 hp (3,300 kW)
2 × SSW GU345/34 double-acting electric motors, 1,000 hp (740 kW)
Speed: 19 knots (35 km/h; 22 mph) surfaced
7.3 knots (13.5 km/h; 8.4 mph) submerged
Range: 25,620 nmi (47,450 km) at 10 knots (19 km/h; 12 mph) surfaced
117 nmi (217 km) at 4 kn (7.4 km/h; 4.6 mph) submerged
Test depth: 230 m (750 ft)
Complement: 48 to 56
Armament: 6 × 55 cm (22 in) torpedo tubes (4 bow, 2 stern)
22 × torpedoes
1 × Utof 105 mm (4.1 in)/45 deck gun with 110 rounds
Service record
Commanders: Kptlt. Hans Hilbig
Victories: 1 ship 5458 GRT

German submarine U-1230 was a Type IXC/40 U-boat of the German Kriegsmarine during World War II.

Laid down on 15 March 1943 at the Deutsche Werft in Hamburg, and commissioned on 26 January 1944 under the command of Kptlt. Hans Hilbig, it only undertook one patrol, operating from Horten, Norway, returning safely to Kristiansand, Norway in early 1945.

At the end of the war it was captured by the Allies, transferred to Loch Ryan in Scotland, and destroyed by the Royal Navy frigate HMS Cubitt as part of "Operation Deadlight". Unusually for a U-boat, U-1230 does not seem to have suffered any casualties during the war.

Its one war patrol was of historical interest less for its role in the Battle of the Atlantic (a Canadian steamer of 5,458 tons was its sole victim), than for its role in transporting two German spies to the United States. William Curtis Colepaugh and Eric Gimpel were landed at Hancock Point in the Gulf of Maine on 29 November 1944 in "Operation Elster" ("Magpie"). The mission was intended to sabotage the Manhattan Project but failed, and both spies were captured.

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