Nuclear-powered icebreaker
On 17 August 1977, NS "Arktika" ("Arctic") became the first surface ship ever to reach the North Pole. "Arktika" was withdrawn from service in 2008 after clocking up 175,000 hours of reactor operation time and covering more than 1 million nautical miles. Rather than be scrapped, there are calls for her to be converted to a museum ship, like her predecessor "Lenin".
Sisu (1938 icebreaker)
The Finnish Board of Navigation decommissioned "Sisu", now the oldest and smallest icebreaker in the state-owned fleet, in 1974. At the time, Finland had a fleet of nine diesel-electric icebreakers in service and two more under construction. The new icebreakers, which had nearly five times the displacement and more than five times the power of the old "Sisu", were designed to guarantee year-round traffic to all Finnish ports in the Bothnian Bay. The second of these icebreakers was named "Sisu" in 1975.