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The climbers push themselves to exhaustion, and they still have a vertical ice wall to climb. Gus runs into trouble while Nikki pushes herself beyond fatigue.

When a series of ice bridges collapse up on the mountain trail, the team scrambles to learn crevasse rescue training. Pete’s body becomes cumbersome while Chuck shows signs of illness.

The team tackles their first mountain, Ishinca, but the weight of their gear quickly wears them down. Nikki looks to redeem herself while Chuck’s cough raises concerns.

Mountaineering gets very real as the team attempts to summit the 18,000-foot Mount Ishinca. Pete tests his limits while Chuck shows that he has the heart of a fighter.

The team learns that getting down from the summit is just as hard as getting up, and an old injury comes back to haunt Steve-O.

Summit Day. The group attempts their ultimate goal, to reach the peak of Mt. Tocllaraju. Steve-O has a plan while Chachi battles the extreme cold.

In the series finale, the last members of the expedition make a final exhausting push to the summit of Mt. Tocllaraju… but not everything goes as planned.