History
German Empire
Name	U-124
Ordered	27 May 1916
Builder	Blohm & Voss, Hamburg
Yard number	301
Launched	28 March 1918
Commissioned	12 July 1918
Fate	Surrendered 1 December 1918; scrapped Swansea 1920
General characteristics [1]
Class and type	Type UE II submarine
Type	Coastal minelaying submarine
Displacement	1,163 t (1,145 long tons) surfaced 1,468 t (1,445 long tons) submerged
Length	82.00 m (269 ft) (o/a) 61.32 m (201 ft 2 in) (pressure hull)
Beam	7.42 m (24 ft 4 in)
Height	10.16 m (33 ft 4 in)
Draught	4.22 m (13 ft 10 in)
Installed power	2 × diesel engines, 2,400 PS (1,765 kW; 2,367 shp) 2 × electric motors, 1,235 PS (908 kW; 1,218 shp)
Propulsion	2 shafts, 2 × 1.61 m (5 ft 3 in) propellers
Speed	14.7 knots (27.2 km/h; 16.9 mph) surfaced 7.2 knots (13.3 km/h; 8.3 mph) submerged
Range	11,470 nmi (21,240 km; 13,200 mi) at 8 knots (15 km/h; 9.2 mph) surfaced 35 nmi (65 km; 40 mi) at 4.5 knots (8.3 km/h; 5.2 mph) submerged
Test depth	75 m (246 ft)
Complement	4 officers, 36 enlisted
Armament	4 × 50 cm (19.7 in) bow torpedo tubes 12 torpedoes 2 × 100 cm (39 in) stern mine chutes 42 mines 1 × 15 cm (5.9 in) SK L/45 deck gun 494 rounds
Service record
Commanders:	Kptlt. Rolf Carls[2] 12 July – 11 November 1918
Operations:	None
Victories:	None

SM U-124^{[Note 1]} was one of the 329 submarines serving in the Imperial German Navy in World War I. U-124 was engaged in the naval warfare and took part in the First Battle of the Atlantic under the command of Kapitänleutnant Rolf Carls (later a Generaladmiral in the Kriegsmarine).^[3]

She was interned at Karlskrona on 13 November 1918, but then surrendered to the Allies at Harwich on 1 December 1918 in accordance with the requirements of the Armistice with Germany. Lying at Portland, she was sold to James Dredging Co. on 3 March 1919 for £3,000, but then re-sold to George Cohen, who towed the boat to Swansea for scrapping. However, U-124 foundered there in October 1920, although was later salvaged and finally broken up.^[4]

Type UE II submarines were preceded by the shorter Type UE I submarines. U-124 had a displacement of 1,163 tonnes (1,145 long tons) when at the surface and 1,468 tonnes (1,445 long tons) while submerged.^[1] She had a total length of 82 metres (269 ft), a beam of 7.4 m (24 ft 3 in), a height of 10.16 m (33 ft 4 in), and a draught of 4.22 m (13 ft 10 in). The submarine was powered by two 2,400 metric horsepower (1,800 kW; 2,400 shp) engines for use while surfaced, and two 1,235 metric horsepower (908 kW; 1,218 shp) engines for use while submerged. She had two shafts and two 1.61 m (5.3 ft) propellers. The boat was capable of operating at depths of up to 75 metres (246 ft).^[1]

The submarine had a maximum surface speed of 14.7 knots (27.2 km/h; 16.9 mph) and a maximum submerged speed of 7.2 knots (13.3 km/h; 8.3 mph).^[1] When submerged, she could operate for 35 nautical miles (65 km; 40 mi) at 4.5 knots (8.3 km/h; 5.2 mph); when surfaced, she could travel 11,470 nautical miles (21,240 km; 13,200 mi) at 8 knots (15 km/h; 9.2 mph). U-124 was fitted with four 50 centimetres (20 in) torpedo tubes (fitted at its bow), twelve torpedoes, two 100 centimetres (39 in) mine chutes (fitted at its stern), forty-two mines, one 15 cm (5.9 in) SK L/45 deck machine gun, and 494 rounds. She had a complement of forty (thirty-six crew members and four officers).^[1]

• Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.