SM UC-25 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 29 August 1915 and was launched on 10 June 1916. She was commissioned into the German Imperial Navy on 28 June 1916 as SM UC-25.^{[Note 1]} In 13 patrols UC-25 was credited with sinking 21 ships, either by torpedo or by mines laid. From March to September 1918, she was commanded by Karl Dönitz, later grand admiral in charge of all U-boats in World War II. UC-25 was scuttled at Pola on 28 October 1918 on the surrender of Austria-Hungary.^[1]

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History
German Empire
Name	UC-25
Ordered	29 August 1915[1]
Builder	AG Vulcan, Hamburg[2]
Yard number	64[1]
Launched	10 June 1916[1]
Commissioned	28 June 1916[1]
Fate	Scuttled at Pola, 28 October 1918[1]
General characteristics [3]
Class and type	German Type UC II submarine
Displacement	400 t (390 long tons), surfaced 480 t (470 long tons), submerged
Length	49.45 m (162 ft 3 in) o/a 39.30 m (128 ft 11 in) pressure hull
Beam	5.22 m (17 ft 2 in) o/a 3.65 m (12 ft) pressure hull
Draught	3.68 m (12 ft 1 in)
Propulsion	2 × propeller shafts 2 × 6-cylinder, 4-stroke diesel engines, 500 PS (370 kW; 490 bhp) 2 × electric motors, 460 PS (340 kW; 450 shp)
Speed	11.6 knots (21.5 km/h; 13.3 mph), surfaced 6.6 knots (12.2 km/h; 7.6 mph), submerged
Range	9,260 nmi (17,150 km; 10,660 mi) at 7 knots (13 km/h; 8.1 mph), surfaced 53 nmi (98 km; 61 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	48-second diving time
Service record
Part of:	Baltic Flotilla 12 September 1916 – 15 April 1917 Pola / Mittelmeer / Mittelmeer II Flotilla 15 April 1917 – 11 November 1918
Commanders:	Kptlt. Johannes Feldkirchner[4] 28 June 1916 – 17 July 1917 Oblt.z.S. Walter Lippold[5] 18 July – 13 December 1917 Oblt.z.S. Freiherr Ernst von Wangenheim[6] 14 December 1917 – 15 February 1918 Oblt.z.S. Karl Dönitz[7] 16 February – 7 August 1918
Operations:	13 patrols
Victories:	17 merchant ships sunk (16,872 GRT) 3 warships sunk (2,201 tons) 1 auxiliary warship sunk (255 GRT) 4 merchant ships damaged (22,035 GRT) 2 warships damaged (6,500 tons) 1 auxiliary warship damaged (6,335 GRT)

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A German Type UC II submarine, UC-25 had a displacement of 400 tonnes (390 long tons) when at the surface and 480 tonnes (470 long tons) while submerged. She had a length overall of 49.45 m (162 ft 3 in), a beam of 5.22 m (17 ft 2 in), and a draught of 3.68 m (12 ft 1 in). The submarine was powered by two six-cylinder four-stroke diesel engines each producing 250 metric horsepower (180 kW; 250 shp) (a total of 500 metric horsepower (370 kW; 490 shp)), two electric motors producing 460 metric horsepower (340 kW; 450 shp), and two propeller shafts. She had a dive time of 48 seconds and was capable of operating at a depth of 50 metres (160 ft).^[3]

The submarine had a maximum surface speed of 11.6 knots (21.5 km/h; 13.3 mph) and a submerged speed of 6.6 knots (12.2 km/h; 7.6 mph). When submerged, she could operate for 53 nautical miles (98 km; 61 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 9,260 nautical miles (17,150 km; 10,660 mi) at 7 knots (13 km/h; 8.1 mph). UC-25 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]