As they near the half waypoint of their 3,000-mile expedition, the explorers brave Alaska's infamous "Bear Highway".

On the third leg of the expedition, Alaska lays down a new gauntlet.

The eight explorers struggle to stay afloat as they navigate the whitewater rapids of the Talachulitna River Valley.

It's day 32 of the 40-day expedition, and the explorers are confronted with their biggest obstacle yet: the Nizina River.

The explorers travel to Admiralty Island, home to one of the highest density densities of brown bears in North America.

In the frigid waters of the Prince William Sound, eight explorers must paddle 40 miles through a minefield of icebergs and glaciers.

On the last leg of the 3,000-mile journey, the explorers must summit a massive mountain of rock and ice in the Juneau Icefield.

Eight of Alaska's toughest outdoorsmen embark on a ten-leg expedition, traversing a 3,000-mile route across the brutal Alaskan terrain.

On the last leg of the 3,000-mile journey, the explorers must summit a massive mountain of rock and ice in the Juneau Icefield.

On the second leg of their 3,000-mile journey through the Alaskan wilderness, the eight tenacious explorers take on the massive Yukon River.

At the halfway mark, the eight explorers are starving. The men barely have enough strength to press on, and the journey isn't getting any easier.

Racing to Twin Falls there's danger as the Mountaineers try to cross the whitewater rapids of Coal Creek - and Tyler gets washed away.