Type UB II submarine

SM UB-45
Class overview
Builders	AG Weser, Bremen Blohm & Voss, Hamburg
Operators	Imperial German Navy  French Navy
Preceded by	UB I
Succeeded by	UB III
Built	1915–1916
In commission	1915–1931
Completed	30
Active	0
Lost	20[1]
Preserved	1 (UB-46 was salvaged)
General characteristics
Displacement	263–279 t (259–275 long tons) surfaced 292–305 t (287–300 long tons) submerged
Length	36.13–36.90 m (118 ft 6 in – 121 ft 1 in) (o/a)
Beam	4.36 m (14 ft 4 in)
Draught	3.66–3.75 m (12 ft 0 in – 12 ft 4 in)
Installed power	Körting, Daimler or Benz diesel engines, 270–284 PS (199–209 kW; 266–280 bhp) Siemens-Schuckert electric motor, 280 PS (206 kW; 276 shp)
Propulsion	1 shaft, 1 1.15 m (3 ft 9 in) propeller
Speed	8.82–9.15 knots (16.33–16.95 km/h; 10.15–10.53 mph) surfaced 5.71–6.22 knots (10.57–11.52 km/h; 6.57–7.16 mph) submerged
Range	6,450–7,200 nmi (11,950–13,330 km; 7,420–8,290 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced 45 nmi (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth	50 m (160 ft)
Complement	2 officers, 21 men
Armament	2 × 50 cm (19.69 in) bow torpedo tubes 2 external stern tubes fitted in some boats 1 × 5 cm (1.97 in) or 8.8 cm (3.46 in) deck gun

The UB II type submarine was a class of U-boat built during World War I by the German Imperial Navy. They were enlarged from the preceding type UB I and were more effective vessels. The boats were a single hull design with a 50-metre maximum diving depth and a 30-45 second diving time. In 1915 and 1916, 30 were built at two different shipyards.^[2]