An accident at sea cripples a Royal Navy expedition, forcing its captains to make a dire choice.

After a long winter trapped in the ice, a team scouting for open water makes a chilling discovery.

With something stalking the ships, the expedition's commanders debate their dwindling options.

A series of cunning attacks on the ships proves to the men they are not battling an ordinary bear.

A strange illness begins to take hold while another familiar one endangers a captain's judgment.

The officers consider an 800-mile walkout, but plan a party to raise the men's worsening spirits.

After the men abandon ships, a series of shocking events underscores how vulnerable they've become.

Paranoia divides the men after an officer is killed under mysterious circumstances.

Hope comes in strange forms as the men discover what they are ultimately willing to do to survive.

The expedition's epic journey reaches its climax in a final confrontation of mythic proportions.