Bear Grylls faces one of Alaska's toughest environments, the Chugach Mountains.

Bear uses his knowledge of American Indian survival techniques in the Sierra Nevada.

Bear travels across Kenya.

Climbers survive in the Alps in potentially fatal conditions.

Bear Grylls demonstrates how to stay alive in the dangerous waters of the Everglades.

Bear Grylls demonstrates how to make a snow cave, find water in deep tunnels and avoid frostbite in Iceland's arctic conditions.