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For this reason, in the Baltic Sea, the Great Lakes and the Saint Lawrence Seaway, and along the Northern Sea Route, the main function of icebreakers is to escort convoys of one or more ships safely through ice-filled waters. When a ship becomes immobilized by ice, the icebreaker has to free it by breaking the ice surrounding the ship and, if ...
This is a list of icebreakers and other special icebreaking vessels (except cargo ships and tankers) capable of operating independently in ice-covered waters. Ships known to be in service are presented in bold .
Polar-class icebreakers USCGC Polar Star (WAGB-10), USCGC Polar Sea (WAGB-11) are heavy icebreakers operated by the United States Coast Guard (USCG). These cutters, specifically designed for icebreaking, have reinforced hulls, special icebreaking bows, and a system that allows rapid shifting of ballast to increase the effectiveness of their icebreaking.
Nuclear icebreaker Yamal, 2015. A nuclear-powered icebreaker is an icebreaker with an onboard nuclear power plant that produces power for the vessel's propulsion system. . Although more expensive to operate, nuclear-powered icebreakers provide a number of advantages over their diesel-powered counterparts, especially along the Northern Sea Route where diesel-powered icebreaker operations are ...
HMS Endurance was an icebreaker that served as the Royal Navy ice patrol ship between 1991 and 2008. Built in Norway as MV Polar Circle , she was chartered by the Royal Navy in 1991 as HMS Polar Circle , before being purchased outright and renamed HMS Endurance in 1992 as a replacement for the previous HMS Endurance whose hull had been weakened ...
Cargo ship navigating in ice, Gulf of Bothnia Icebreaking bow of the tanker Timofey Guzhenko. Ice navigation vessel or Ice-strengthened vessel is a class of ships specially prepared for independent ice navigation in the waters of the polar seas and for following icebreakers in especially difficult ice conditions.
USCGC Healy (WAGB-20) is the United States' largest and most technologically advanced icebreaker as well as the US Coast Guard's largest vessel. [1] She is classified as a medium icebreaker by the Coast Guard. [1]
The curved bow allows Polar Star to ride up on the ice, using the ship's weight to break the ice. [ 4 ] The 13,000-ton (13,200-metric ton) Polar Star is able to break through ice up to 21 feet (6.4 m) thick by backing and ramming, and can steam continuously through 6 feet (1.8 m) of ice at 3 knots (5.6 km/h).