Jeff and Laura get smacked with a dangerous, destructive typhoon.

Jeff and Laura explore the jungle to find more resources post-typhoon.

It's Day 21, and Jeff and Laura prepare for the difficult 12-mile journey ahead of them. At the end of the trek awaits a new challenge - to begin a new 40-day XL challenge with 12 strangers.

Nine people face hunger, fatigue and more on Venezuela's Mt. Roraima.

The group grows desperate at night with no water.

The survivalists face the realities of the backcountry in a new campsite.

The group finds shelter in a Pemon Indian hut as tensions rise.

The final six survivalists catch a break during a big fishing trip.

Nick and Brad are stuck in a flood while Ryan considers hitting the button.

A celebration is cut short and emotions run high for the last of the group.

Physical exertion takes its toll on the group's final push to escape.

Climbers arrive at base camp and quickly learn the dangers of the mountain.

Hundreds of climbers at Advanced Base Camp prepare for the climb.

Russell splits the expedition in two for the five-day summit assault.

The teams race against the clock as they run out of time and air.

Some climbers reach the top, but then get caught in a line to descend.