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Travel at the heart of the Arctic sea ice
Open water lead in the sea ice, Canadian Arctic Archipelago. The ice cap forms a continuous layer 6.5 to 9.8 ft (2 to 3 meters) thick in winter, except for a few polynyas. The sea ice breaks up because of warmer temperatures at spring or movements of marine currents and winds, creating impressive open water lead up to hundreds of meters wide.
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