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 "Arktika" was withdrawn from service in 2008 after clocking up 175,000 hours of reactor operation time and covering more than 1 million nautical miles.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".
Sibir (1937 icebreaker)
The "I. Stalin" was the biggest icebreaker of the Soviet fleet at that time. In 1938 it reached the Arctic in its first expedition.