Polar Star (WAGB-10) is a United States Coast Guard Heavy Icebreaker commissioned in 1976 and built, along with her sister ship, Polar Sea (WAGB-11), in Seattle (Washington), which is also its homeport. It has sufficient hull strength to absorb the high-powered ice breaking common to her operations. The curved bow allows Polar Star to ride up on the ice, using the ship's weight to break the ice. It is able to break through ice up to 6.4m thick by backing and ramming, and can steam continuously through 1.8m of ice at 3 knots (5.6 km/h).
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