Blue skies in Grand Teton National Park turn gray when a group of hikers are caught in a powerful rockslide.

Yev Krasnitskiy and his three climber partners find themselves stranded without supplies while a storm prevents rescuers from reaching them.

On a 600 mile canoe trip, Alex Messenger encounters a grizzly while hiking alone on the Canadian tundra.

In 1999, Malcolm Daly fell 200 feet while climbing a remote Alaskan peak. He spent the next two nights stranded and alone on an ice ledge.

Ryan Osmun, 35, took a wrong step while hiking in Zion National Park in February, and became trapped in quicksand.

In our season finale, hear from experts to learn what's happening inside your brain during a survival scenario, what you can do to beat the odds, and how a former BACKPACKER editor nearly succumbed to the greatest threat out there—ourselves. 

Stacy Liedle and her team continue to fight for their lives on the Emmons Glacier. With a storm fast approaching, the SAR team rushes to get everyone down safely—and then, tragedy strikes. 

For Stacy Liedle and her team, reaching the summit of Washington's Mt. Rainier was the accomplishment of a lifetime. But a fall while descending the Emmons Glacier leaves the four climbers severely injured and in need of a rescue—before a winter storm strands them on the mountain. 

Gregg Hein spent 6 days in Kings Canyon National Park alone after suffering a brutal open leg fracture.

An afternoon hike very nearly turned deadly when Scott Vuncannon was bit by a rattlesnake in the North Carolina backcountry without cell reception.