SM UC-74^{[Note 1]} was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 12 January 1916 and was launched on 19 October 1916. She was commissioned into the German Imperial Navy on 26 November 1916 as SM UC-74. In ten patrols UC-74 was credited with sinking 37 ships, either by torpedo or by mines laid. UC-74 was interned at Barcelona on 21 November 1918 when she ran out of fuel. The U-boat was surrendered to France on 26 March 1919 and was broken up at Toulon in July 1921.^[1]

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History
German Empire
Name	UC-74
Ordered	12 January 1916[1]
Builder	AG Vulcan, Hamburg[2]
Yard number	79[1]
Launched	19 October 1916[1]
Commissioned	26 November 1916[1]
Fate	Interned at Barcelona, 21 November 1918; surrendered to France, March 1919; broken up in Toulon, July 1921[1]
General characteristics [3]
Class and type	German Type UC II submarine
Displacement	410 t (400 long tons), surfaced 493 t (485 long tons), submerged
Length	50.45 m (165 ft 6 in) o/a 40.30 m (132 ft 3 in) pressure hull
Beam	5.22 m (17 ft 2 in) o/a 3.65 m (12 ft) pressure hull
Draught	3.65 m (12 ft)
Propulsion	2 × propeller shafts 2 × 6-cylinder, 4-stroke diesel engines, 580–600 PS (430–440 kW; 570–590 shp) 2 × electric motors, 620 PS (460 kW; 610 shp)
Speed	11.8 knots (21.9 km/h; 13.6 mph), surfaced 7.3 knots (13.5 km/h; 8.4 mph), submerged
Range	8,660–10,230 nmi (16,040–18,950 km; 9,970–11,770 mi) at 7 knots (13 km/h; 8.1 mph) surfaced 52 nmi (96 km; 60 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	50 m (160 ft)
Complement	26
Armament	6 × 100 cm (39.4 in) mine tubes 18 × UC 200 mines 3 × 50 cm (19.7 in) torpedo tubes (2 bow/external; one stern) 7 × torpedoes 1 × 8.8 cm (3.5 in) Uk L/30 deck gun
Notes	30-second diving time
Service record
Part of:	Pola / Mittelmeer / Mittelmeer II Flotilla 17 March 1917 – 11 November 1918
Commanders:	Kptlt. Wilhelm Marschall[4] 26 November 1916 – 6 December 1917 Oblt.z.S. Hans Adalbert von der Lühe[5] 15 February – 6 August 1918 Oblt.z.S. Hans Schüler[6] 7 August – 21 November 1918
Operations:	10 patrols
Victories:	35 merchant ships sunk (92,265 GRT) 2 auxiliary warships sunk (457 GRT) 4 merchant ships damaged (13,108 GRT)

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A German Type UC II submarine, UC-74 had a displacement of 410 tonnes (400 long tons) when at the surface and 493 tonnes (485 long tons) while submerged. She had a length overall of 50.45 m (165 ft 6 in), a beam of 5.22 m (17 ft 2 in), and a draught of 3.65 m (12 ft). The submarine was powered by two six-cylinder four-stroke diesel engines each producing 290–300 metric horsepower (210–220 kW; 290–300 shp) (a total of 580–600 metric horsepower (430–440 kW; 570–590 shp)), two electric motors producing 620 metric horsepower (460 kW; 610 shp), and two propeller shafts. She had a dive time of 30 seconds and was capable of operating at a depth of 50 metres (160 ft).^[3]

The submarine had a maximum surface speed of 11.8 knots (21.9 km/h; 13.6 mph) and a submerged speed of 7.3 knots (13.5 km/h; 8.4 mph). When submerged, she could operate for 52 nautical miles (96 km; 60 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,660 to 10,230 nautical miles (16,040 to 18,950 km; 9,970 to 11,770 mi) at 7 knots (13 km/h; 8.1 mph). UC-74 was fitted with six 100 centimetres (39 in) mine tubes, eighteen UC 200 mines, three 50 centimetres (20 in) torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one 8.8 cm (3.5 in) Uk L/30 deck gun. Her complement was twenty-six crew members.^[3]