Thickest sea ice
Last updated: October 22, 2017 at 4:21 am
Multiyear (perennial) ice in the Arctic Ocean can reach more than 4 m (13 ft) thick with ridges up to 20 m (66 ft) thick. First-year ice that grows over a single winter may reach a maximum thickness of about 2 m (6.6 ft).
Canadian Ice Service
NASA Earth Observatory
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Jeffrey Gallant is the Editor-in-Chief and Records Keeper of the Diving Almanac. He is also a contributing editor of DIVER Magazine, and the scientific director of the Greenland Shark and Elasmobranch Education and Research Group (GEERG). Jeffrey started diving in 1982.