German Type UC II submarine

Two Type UC II submarines alongside Austro-Hungarian depot ship Amphitrite at Gjenovic, Bocche di Cattaro, in the Adriatic Sea
Class overview
Builders:	AG Weser, Bremen Blohm & Voss, Hamburg Vulcan, Hamburg Germaniawerft, Kiel
Operators:	Kaiserliche Marine
Preceded by:	UC I
Succeeded by:	UC III
Cost:	1,729,000–2,141,000 German Mark
Built:	1916–1918
In commission:	1916–1918
Building:	64
Planned:	64
Completed:	64
Lost:	46
General characteristics
Type:	Coastal minelaying submarine
Displacement:	400–434 t (394–427 long tons) surfaced 480–511 t (472–503 long tons) submerged
Length:	49.35–53.15 m (161 ft 11 in–174 ft 5 in) o/a
Beam:	5.22 m (17 ft 2 in)
Draught:	3.65 m (12 ft)
Propulsion:	2 shafts 6-cylinder diesel engines, 500–600 PS (370–440 kW; 490–590 shp) Siemens-Schuckert electric motors, 460–620 PS (340–460 kW; 450–610 shp)
Speed:	11.6–12 knots (21.5–22.2 km/h; 13.3–13.8 mph) surfaced 6.7–7.4 knots (12.4–13.7 km/h; 7.7–8.5 mph) submerged
Range:	7,280–10,040 mi (11,720–16,160 km) at 7 knots (13 km/h; 8.1 mph) surfaced 52–60 mi (84–97 km) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth:	50 m (160 ft)
Complement:	3 officers, 23 enlisted
Sensors and processing systems:	1 periscope
Armament:	2 × 50 cm (19.7 in) external bow torpedo tubes 1 × internal stern tube (7 torpedoes) 1 × 8.8 cm (3.5 in) or 10.5 cm (4.1 in) deck gun 1 machine gun 18 × Type UC 200 mines in 6 internal chutes

Type UC II minelaying submarines were used by the Imperial German Navy during World War I. They displaced 417 tons, carried guns, 7 torpedoes and up to 18 mines. The ships were double-hulled with improved range and seakeeping compared to the UC I type.

If judged only by the numbers of enemy vessels destroyed, the UC II is the most successful submarine design in history: According to modern estimates, they sank more than 1800 enemy vessels.

There were 64 Type UC II submarines commissioned into the Imperial German Navy.