O 12-class submarine

	HNLMS O 12
Class overview
Name	O 12
Builders	Koninklijke Maatschappij De Schelde (3); Fijenoord (1);
Operators	Royal Netherlands Navy
Preceded by	O 9 class
Succeeded by	O 16
Built	1928–1932
In commission	1931–1945
Completed	4
General characteristics
Type	Submarine
Displacement	610 tons surfaced; 754 tons submerged;
Length	60.42 m (198 ft 3 in)
Beam	6.83 m (22 ft 5 in)
Draught	3.6 m (11 ft 10 in)
Propulsion	2 × 900 bhp (671 kW) diesel engines; 2 × 310 bhp (231 kW) electric motors;
Speed	16 kn (30 km/h; 18 mph) surfaced; 8 kn (15 km/h; 9.2 mph) submerged;
Range	3,500 nmi (6,500 km; 4,000 mi) at 8 kn (15 km/h; 9.2 mph) or 10 kn (19 km/h; 12 mph) on the surface; 26 nmi (48 km; 30 mi) at 8 kn (15 km/h; 9.2 mph) submerged;
Complement	29–31
Armament	4 × 21 inch bow torpedo tubes; 1 × 21 inch stern torpedo tube ; 2 × 44 mm guns; 1 × 12.7 mm machine gun;

The O 12-class submarine consisted of four submarines built for the Royal Netherlands Navy. The ships, with a diving depth of 60 metres (200 ft), were used for patrols in the Dutch home waters. The class comprised O 12, O 13, O 14 and O 15. O 12 entered German service in 1943 as UD-2.

Class overview
HNLMS O 12
Name	O 12
Builders	Koninklijke Maatschappij De Schelde (3) Fijenoord (1)
Operators	Royal Netherlands Navy
Preceded by	O 9 class
Succeeded by	O 16
Built	1928–1932
In commission	1931–1945
Completed	4
General characteristics
Type	Submarine
Displacement	610 tons surfaced 754 tons submerged
Length	60.42 m (198 ft 3 in)
Beam	6.83 m (22 ft 5 in)
Draught	3.6 m (11 ft 10 in)
Propulsion	2 × 900 bhp (671 kW) diesel engines 2 × 310 bhp (231 kW) electric motors
Speed	16 kn (30 km/h; 18 mph) surfaced 8 kn (15 km/h; 9.2 mph) submerged
Range	3,500 nmi (6,500 km; 4,000 mi) at 8 kn (15 km/h; 9.2 mph) or 10 kn (19 km/h; 12 mph) on the surface 26 nmi (48 km; 30 mi) at 8 kn (15 km/h; 9.2 mph) submerged
Complement	29–31
Armament	4 × 21 inch bow torpedo tubes 1 × 21 inch stern torpedo tube 2 × 44 mm guns 1 × 12.7 mm machine gun