The mine layer HNoMS Laugen was built for the Royal Norwegian Navy during World War I, as the lead ship of a two ship class. Her sister ship was Glommen.

History
Norway
Name	Laugen
Namesake	Lågen River
Builder	Akers Mek. verksted in Kristiania
Launched	1918
Captured	by the Germans on 14 April 1940
Nazi Germany
Name	NN 05
Acquired	14 April 1940
Renamed	M 22
Fate	Handed back to Norway after VE Day
Service record
Operations:	Occupation of Norway by Nazi Germany
Norway
Name	Laugen
Acquired	1945
Decommissioned	Decommissioned and sold to civilian interests in 1950
Fate	Sold for scrapping in March 1978, bought by the Royal Norwegian Air Force in 1979 and expended as a target ship on 6 June 1979.
General characteristics
Class and type	Glommen class minelayer
Displacement	351 tons
Length	42 m (137.80 ft)
Beam	8.5 m (27.89 ft)
Draft	2.1 m (6.89 ft)
Propulsion	Two triple expansion steam engines with a total of 340 hp
Speed	9.5 knots (17.59 km/h)
Complement	39 men
Armament	2 × 76 mm (2.99 in) guns 120 mines
Notes	All the above listed info was retrieved from [1]

She and her sister ship were kept in service until the German invasion of Norway in 1940. Laugen surrendered to the Germans on 14 April 1940, and like her sister ship was rebuilt as a floating anti-aircraft battery. She was returned to the Royal Norwegian Navy in 1945 and decommissioned in 1950.

Laugen was built at Akers mekaniske verksted in Kristiania. She was named after the river Lågen in southern Norway.