Walruses gather on the pack ice at the edge of Spitsbergen, roughly 1,000 kilometers from the North Pole, and this film follows biologist and survival expert Jason Roberts as he tracks them there. Males can weigh up to 1,500 kilograms, most of it fat under leathery skin, and their tusks turn out to be tools rather than just weapons: ice picks for hauling that bulk back onto the floes, and rakes for rummaging through the seafloor mud for snails, crabs, and clams. The footage follows walruses feeding underwater, work rarely captured on camera, and tracks the strict social hierarchy Roberts has studied for years among the herds on Prinz Karls Forland. Polar bears surface as the main threat, hunting walrus calves rather than adults, and the film also puts a Greenland shark in frame, one of the odder predators sharing these waters. Calving glaciers and the tidal waves they trigger round out the picture of a coastline built entirely around ice and cold.