The CCGS Henry Larsen is built to smash through ten-foot-thick sea ice, and this episode follows her crew through a North Atlantic winter storm off Newfoundland and Labrador. The Canadian Coast Guard ship escorts supply vessels, frees ships trapped in the pack ice, and keeps isolated coastal settlements supplied when the ice cuts them off from the mainland. Cameras follow the bridge crew as they read the ice ahead, the support helicopter scouting routes from above, and the deck operations that keep the ship running in hurricane-force wind. The season's biggest storm churns the pack ice into an unpredictable mass, forcing the ship and her crew to push harder than usual, with the film laying out just how much can go wrong for both the vessel and the villages depending on her. It is a straightforward, footage-driven look at the machinery and seamanship involved in keeping a frozen coastline connected, told through the people doing the work rather than through narration alone.