SM UB-31

SM UB-45 a u-boat similar to UB-31
Career (German Empire)
Name:	UB-31
Ordered:	22 July 1915[1]
Builder:	Blohm & Voss, Hamburg[1]
Cost:	1,152,000 German Papiermark[2]
Yard number:	255[1]
Launched:	16 November 1915[1]
Completed:	24 March 1916[1]
Commissioned:	25 March 1916[3]
Fate:	sunk 2 May 1918 by British warships[3]
General characteristics
Class & type:	German Type UB II submarine
Displacement:	274 t (270 long tons) surfaced[2] 303 t (298 long tons) submerged[2]
Length:	36.9 m (121 ft 1 in)[2]
Beam:	437 m (1,433 ft 9 in)[2]
Draft:	3.69 m (12 ft 1 in)[2]
Propulsion:	2 × propeller shafts 2 × Benz diesel engines, 270 shp (200 kW)[2] 2 × Siemens-Schuckert electric motor, 280 shp (210 kW)[2]
Speed:	9.06 knots (16.78 km/h; 10.43 mph) surfaced[2] 5.71 knots (10.57 km/h; 6.57 mph) submerged[2]
Range:	7,030 nautical miles (13,020 km; 8,090 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced[2] 45 nmi (83 km; 52 mi) at 4 knots submerged[2]
Test depth:	50 m (160 ft)[2]
Complement:	2 officers, 21 men[2]
Armament:	2 × 50 cm (19.7 in) torpedo tubes[2] 4 × torpedoes (later 6) 1 × 5 cm SK L/40 gun[2]
Notes:	42-second diving time[2]

SM UB-31 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 22 July 1915 and launched on 16 November 1915. She was commissioned into the German Imperial Navy on 25 March 1916 as SM UB-31.^{[Note 1]}

The submarine sank 26 ships in 25 patrols. UB-31 was depth charged and sunk by British warships HMS Lord Leitrim, HMS Loyal Friend, and HMS Ocean Roamer in the English Channel on 2 May 1918.^[3]

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