Trial by Fire

The Howe brothers' crew builds an all-terrain wheelchair for a veteran.

The Howes take on building and testing a prop vehicle for a major motion picture. Meanwhile the crew moves forward on the Riptide amphibious vehicle, including a dangerous test of its escape hatch system underwater.

Time is ticking on the Riptide project. The Howe & Howe team bears down, but their first test with the Riptide is disasterous. But it's not all bad news. Mike's seemingly tangent project -- a turret for the Riptide -- is an explosive success.

It’s the 11th hour for the Howe & Howe team, one week before they present the amphibious Riptide to the Army. With a key member in the hospital, the team will have to scramble more than ever to fix what caused catastrophic engine failure.

Rescuing stranded climbers with no coordinates is a daunting task.

Jason preps his helicopter for the world's highest landing spot.

Ryan battles the elements racing back to Lukla with sick climbers.

Ryan confronts an uninvited climber trying to hitch a ride at 17,500 feet.

Jason and Siddartha try to save climbers along a treacherous icefall.

Ryan struggles to locate a woman suffering from severe abdominal pains.

With only the gear they can fit into one bag, three couples are dropped in three of the most difficult environments on earth and try to survive the wild, and each other, for three weeks as they make their way back to civilization.

With only the clothes on their backs & the gear in their bag, Jenny and Justin struggle to find their first meal in a week, a raging forest fire forces Mitchell and Jhoanna to flee for their lives; and Max and Linn try to surpass their predecessors.

Mitchell & Johanna struggle through a 16 mile journey to a new camp, only to get caught in a hail storm. Max and Linn battle starvation and each other in the unrelenting jungle. Jenny and Justin’s plan to travel higher into the mountains turns ugly.

In Morocco, Mitchell and Jhoanna endure a massive hailstorm before hunting for their biggest food victory yet. Justin and Jenny finally emerge from a three-day storm in Norway. And in Mexico, Max and Linn experience a huge bounty - and a betrayal.

In Morocco, Mitchell & Jhoanna embark on a trek through higher elevations only to have tempers flare. In Norway, Justin and Jenny try to outrun an Arctic storm. And in Mexico, Max and Linn’s gamble to build a raft to float to civilization backfires.

The survivalists make their final, desperate efforts to reach civilization.