[4] A request for bids was published on 5 June 2004 and by 3 January 2005 the Finnish Navy had received offers from seven shipyards, both domestic and foreign.

[5] In November 2006 the contract for three mine countermeasure vessels was awarded to the Italian shipyard Intermarine S.P.A.[6] The total order worth was 244.8 million euros[1] and it will include a spare parts package.

[9][10] The lead vessel of the class, Katanpää, began its sea trials in March 2011, but due to additional delays it was not delivered until 4 May 2012.

The second vessel, Purunpää, was delivered to the Finnish Navy on 20 August 2013 and arrived in Turku onboard Happy Dynamic one month later.

This improves shock resistance against underwater explosions and reduces the vessels' magnetic, noise and pressure signatures that could detonate the mines.

[7] The low-signature diesel-electric propulsion system consists of two MTU 8V-396-TE74 high-speed diesel engines, each producing 1,000 kW (1,300 hp), and two Voith Schneider propellers.

The larger AUV, HUGIN (High Precision Untethered Geosurvey and Inspection system), which is manufactured by Kongsberg Maritime, is over four meters long and weighs over 800 kg (1,800 lb).

The smaller AUV, REMUS 100 (Remote Environmental Monitoring Unit), weighs only 41 kg (90 lb) and can be used to collect information of the sea floor with its side-scanning sonar at depths of up to 100 metres.

Two ROVs, a Double Eagle by Saab Underwater Systems of Sweden and SeaFox I by Atlas Elektronik of Germany, can be used to identify and destroy naval mines.

The vessels follow a toolbox principle in which a suitable combination of sensors and equipment is selected individually for each mission according to the task and environmental conditions.