Arktika-class icebreaker
The "Arktika" class is a Russian (former Soviet) class of nuclear-powered icebreakers. Formerly known as "Project 10520 nuclear-powered icebreaker", they were the largest and most powerful icebreakers until the 2016 launch of the ship named Arktika. Ships of the "Arktika" class are owned by the federal government, but were operated by the Murmansk Shipping Company (MSCO) until 2008, when they were transferred to the fully government-owned operator Atomflot. Of the ten civilian nuclear-powered vessels built by Russia (and the Soviet Union), six have been of this type. They are used for escorting merchant ships in the Arctic Ocean north of Siberia as well as for scientific and recreational expeditions to the Arctic.
CCGS John G. Diefenbaker
"John G. Diefenbaker" is designed to break level ice with a thickness of and with a snow cover at over 3 knots. In terms of icebreaking capability, this ranks her just below the largest Russian nuclear-powered icebreakers. Her operational range at in Sea State 3 is projected to be over and she can operate in ice at full power for 25 days. The logistical endurance of the vessel will be 270 days. The new icebreaker will be able to achieve a maximum speed of about in open water, but her normal cruising speed is around 12 knots.