Continuing his adventures, Bear is dropped into the Chugach Mountains by the Alaska Air National Guard and faces challenges including black bear-infested forests.

After parachuting into a high altitude lake in the Sierra Nevada mountains, Bear demonstrates how to survive by heading west towards the coast and away from the Nevada desert. Almost immediately, he's forced to scale a huge cliff and risk a 350-foot drop from treacherous, slippery rocks. Following a river, he uses Native American techniques to build a raft, but later must abandon it.

Bear Grylls heads to the African savannah to reveal vital techniques for finding food and water whilst avoiding predators in this extreme environment.

Bear is stranded in the French Alps, part of Europe's greatest mountain range. It's an unforgiving landscape that appears to offer no hope for survival, but Bear shows how to find shelter and food before making his way to safety. He demonstrates how to build a snow shelter to keep a person alive overnight as the temperatures drop to minus 15 degrees.

The swamps of the Everglades, Florida are killers - 60 visitors die annually, including three women attacked in just one week in 2006 by some of the two million alligators. Deadly snakes and scorching heat take their toll too. The Everglades is really a 40-mile wide river - a waterlogged, featureless landscape with almost no solid ground. Bear Grylls demonstrates how to survive in this alligator-infested swamp.

Bear Grylls demonstrates how to survive in Iceland's Arctic conditions by making a snow cave, finding water and avoiding frostbite.