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	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.

Construction

The ships were built by two shipyards. O 12, O 13 and O 14 were built by Koninklijke Maatschappij De Schelde in Vlissingen and O 15 in Rotterdam at Fijenoord shipyard.

Name	Laid down	Launched	Commissioned	Decommissioned
O 12	20 October 1928	8 November 1930	Dutch Navy: 20 July 1931 German Navy: 30 January 1943	6 July 1945 (scuttled)
O 13	1 December 1928	18 April 1931	1 October 1931	13 June 1940
O 14	29 December 1928	3 October 1931	4 March 1932	26 June 1943
O 15	3 March 1930	27 May 1931	28 July 1932	1 September 1945

References

Bibliography

Jalhay, P.C.; Wijn, J.J.A. (1997). Ik nader ongezien! De onderzeeboten van de Koninklijke Marine [I'm Approaching Unseen! The submarines of the Royal Netherlands Navy] (in Dutch). Amsterdam: De Bataafsche Leeuw. ISBN 978-90-6707-462-9.