DISCOVERY HD WORLD

Several pairs of total strangers have to survive the extreme environment and dangerous wildlife of the wilderness, naked and afraid.

Survivalist Bear Grylls treks across the Siberian tundra and into the Sayan Mountains, demonstrating a wide range of survival skills.

Tigre and René put themselves to the test in the Tatacoa desert, with a shortage of water, a labyrinth of rock formations, and scorpion infestations.

Bear will have to skin and disembowel a camel in an attempt to stay alive as he wonders if he will learn to deal with the hardships and the disgusting taste of the camel.

In the vastness of the Sahara desert and the terrifying beauty of towering sand dunes, Bear Grylls tackles extreme survival challenges as he consumes one of the world's deadliest scorpions to survive.

In Scotland's Cairngorm Mountains, adventurer Bear Grylls faces arctic blizzards, traps rabbits for food and uses a deer skin for shelter.

Bear Grylls shows how to make a snow cave, find water in deep tunnels and avoid frostbite in order to survive Iceland's extreme conditions.

In Mexico's Copper Canyon, Bear Grylls demonstrates how to survive by using traditional cave shelters, fishing without lines or nets and even eating mud.

Bear is dropped into the Chugach Mountains of Alaska, where he tries to withstand extreme temperatures, navigate forests and avoid territorial black bears.

Bear drops from a bi-plane into the Chihuahuan Desert in West Texas, where he withstands extreme heat, navigates deep gorges and dodges deadly diamondbacks.

Deep in the heart of Vietnam, Bear Grylls encounters rocky terrain and faces deadly creatures as he journeys along a river.

Bear Grylls travels to the freezing Arctic Circle and survives hunting a reindeer. He also crosses a frozen lake whilst protecting himself against deadly low temperatures.

Bear is locked in the backwoods of Alabama where he navigates freezing white water rapids and braves a raging forest fire. But can he escape a deep limestone cave?

Otto heads to the Congo River using a dugout canoe. As civil war rages in the region, an encounter with armed militia could have fatal consequences.

Bear takes two fans into the Canadian wilderness for their ultimate survival challenge as the individuals face their fears head-on.

Bear Grylls embarks on an adventure to the Mojave Desert and conquers the sandstorm in scorching heat. Later, the brave survival specialist is on a quest to find scorpions, rattlesnakes and coyotes.

Bear skydives into Australia's Northern Territory. He will rely on the survival skills honed by the aboriginal people to survive in this sweltering landscape.

Bear is marooned on a desert island south of Papua New Guinea. He wades across a shark-infested tidal channel and constructs a bamboo windsurfer to make his escape.

In the Everglades of Florida, Otto and Pascal Feyh hunt an invasive species of snake, the Burmese python, which can grow up to five metres long.