The Atle class comprises five icebreakers built for the Swedish and Finnish Transport Agency. The two Finnish ships, Urho and Sisu, are sometimes considered a separate class, but all are operationally identical. The ships were built by Wärtsilä Helsinki Shipyard in Finland and entered service in the mid to late 1970s. The maneuvering system, incorporating dual rudders and dual , represented significant technical innovation. They are also notable for their high level of crew comfort (for their time), to a point where Urho has served the Finnish government as a VIP transport.