The O 2-class submarine consisted of four submarines built by Koninklijke Maatschappij De Schelde in Flushing for the Royal Netherlands Navy. Used for patrols in the Dutch home waters. The class comprised O 2, O 3, O 4 and O 5. Its diving depth was 25 metres (80 ft); during trials with no crew on board a depth of 40 metres (130 ft) was reached.

O 3
Class overview
Name	O 2
Builders	Koninklijke Maatschappij De Schelde, Flushing
Operators	Royal Netherlands Navy
Preceded by	O 1
Succeeded by	O 6
Built	1909–1914
Completed	4
General characteristics
Type	Submarine
Displacement	134 tons – 149 tons
Length	32.13 m (105 ft 5 in)
Beam	3.3 m (10 ft 10 in)
Draught	2.73 m (8 ft 11 in)
Propulsion	1 × 280 bhp (209 kW) diesel engine 1 × 145 bhp (108 kW) electric motor
Speed	11 kn (20 km/h; 13 mph) surfaced 8 kn (15 km/h; 9.2 mph) submerged
Range	500 nmi (930 km; 580 mi) at 10 kn (19 km/h; 12 mph) on the surface 35 nmi (65 km; 40 mi) at 7 kn (13 km/h; 8.1 mph) submerged
Complement	10
Armament	2 × 18 inch bow torpedo tubes