A group of scientists and a film crew suffers a series of tragic mishaps as they explore Peru's Rio Abiseo Park.

A team of scientists head to the mouth of the Galeras Volcano to try and predict the next eruption.

No Turning Back After crossing the North Pacific, the Infinity arrives in Dutch Harbor. Unprepared for the arctic, the crew uses this opportunity to stock up on supplies and ready the boat before making their way into the mouth of the treacherous Northwest Passage.

A race across the Moroccan Sahara becomes a race for survival when a sandstorm strands a runner in the desert with only a day's worth of water.

It All Falls Apart Fear of overwintering in the Arctic becomes more and more real as the crew becomes trapped in ice. Meanwhile, tensions on the ship reach a boiling part pushing one crew member over the edge.

An American whitewater paddling team travels deep into Tibet's Tsango Gorge to run the "Everest of rivers."

American rock-climbers face gunfire from Islamic militants in Kyrgyzstan.

An expedition to the summit of Mt. Hood takes a violent turn when climbers are swept into a lethal crevasse and the rescue helicopter sent to save them crashes.

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