Edge of the Unknown with Jimmy Chin

Skier Angel Collinson falls from a 1000-ft mountain in Alaska.

Alpinist Alex Honnold wants to climb huge walls in Morocco without a rope.

Gerd Serrasolses reflects on a Kayaking mission in which he almost drowned.

Legendary climber Conrad Anker has a heart attack at 20,000 feet.

Travis Rice reflects on the avalanche that catapulted him into the unknown.

Climber Will Gadd risks his life to ascend the frozen Helmcken Falls.

French surfer Justine Dupont tackles Jaws, the biggest wave on the planet.

Alpinist Jimmy Chin is caught in an avalanche no one is supposed to survive.

A brother and sister crossing the Arctic are hunted by polar bears.

A kayaker is killed by a crocodile when his team paddles a river in Africa.