HNLMS O 12 after being launched
History
Netherlands
Name	HNLMS O 12
Builder	Koninklijke Maatschappij De Schelde, Vlissingen
Laid down	20 October 1928
Launched	8 November 1930
Commissioned	20 July 1931
Fate	Scuttled on 14 May 1940, raised and taken over by German
Nazi Germany
Name	UD-2
Commissioned	30 January 1943
Decommissioned	6 July 1944
Fate	Scuttled on 3 May 1945[1]
General characteristics
Class and type	O 12-class submarine
Displacement	610 tons surfaced 754 tons submerged
Length	60.4 m (198 ft 2 in)
Beam	6.8 m (22 ft 4 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	10,000 nmi (19,000 km; 12,000 mi) at 12 kn (22 km/h; 14 mph) on the surface 28 nmi (52 km; 32 mi) at 8.5 kn (15.7 km/h; 9.8 mph) submerged
Complement	29-31
Armament	4 × 21 inch bow torpedo tubes 1 × 21 inch stern torpedo tube 2 × 44 mm guns[2] 1 × 12.7 mm machine gun
Service record as UD-2[1]
Part of:	U-boat Defense School January 1943 – July 1944
Identification codes:	M 35 992
Commanders:	K.Kapt. Franz Venier[3] 30 January 1943 – 1 April 1944 Oblt.z.S. Günther Scholz[4] 2 April – 4 July 1944
Operations:	None
Victories:	None

HNLMS O 12 was a O 12-class submarine of the Royal Netherlands Navy. Built at Koninklijke Maatschappij De Schelde in Vlissingen,^[2] she was launched in 1930 but was unable to take part in military action during World War II. After being scuttled by the Dutch Navy, she was raised by Nazi Germany's Kriegsmarine and taken into service as UD-2, and then scuttled again.^[5]

Service history

Before World War II

In 1935, O 12, with HNLMS O 13, HNLMS O 15, HNLMS Hertog Hendrik, HNLMS Van Ghent, HNLMS Kortenaer and HNLMS Z 5, sailed around the North Sea making stops at Göteborg and Oslo. Two years later, O 12 sailed with sister ship HNLMS O 14 to Surinam and Curaçao.^[5]

During World War II

During the German attack on the Netherlands in 1940, O 12 was at the naval wharf of Willemsoord, Den Helder for periodic maintenance. Unable to make the trip across the North Sea to England, the ship was scuttled.^[5]

The German occupying forces had O 12 raised and sent her to the Wilton-Fijenoord wharf in Rotterdam for repairs. On 30 January 1943, she was taken into service by Nazi Germany's Kriegsmarine, as UD-2. On 6 July 1944, she was taken out of service and moved to Kiel, where she was scuttled in the harbor just before the end of the war. Afterwards, UD-2 was raised and demolished.^[5]