The men pick their route: some take the higher land, some follow the river. Expert climber Willi Prittie leads Brent Sass and Tyler Johnson into the...

The men are divided into two groups, building competing rafts. Mountain man Marty Raney is taking charge, building a colossal raft weighing nearly 2...

Helicopters leave the eight explorers on a snow-capped summit. The men split into three groups and approach a 300-foot cliff, descend a ravine and...

The eight explorers are on the fourth leg of their expedition and are struggling to stay afloat on the Talachulitna River. With currents rushing at...

The explorers brave the dangers of Alaska's "Bear Highway" only to find themselves stranded and fighting to survive Mother Nature's fury on the...

Facing the brink of collapse, the eight starving explorers set out with one mission: harvest as much food as possible from the barren landscape of...

In this leg of the expedition, the eight survivalists paddle 40 miles through a minefield of icebergs and glaciers in Prince William Sound.

On day 32 of the expedition, the explorers traverse the Nizina River Valley, a vast expanse of land known for its lush wildlife, hungry grizzlies and...

The explorers travel to Admiralty Island, home to the highest density of brown bears in North America, and it's not long before they receive a...

On the last leg of the 3,000-mile journey across Alaska, the explorers battle a brutal winter snowstorm as they climb a 5,000 foot mountain in the...