In this survival scenario, hosts Cody and Dave find themselves on a deserted island off the coast of Nova Scotia — in the dead of winter with plummeting temperatures. Despite the freezing temperatures — and his partner's objections — Cody doesn't give in on his indigenous survival strategy, where he lives his life barefoot. Here, he's only wearing shorts and wool socks. The only items they have are those they're able to salvage from the life raft they used to reach the island: an emergency Mylar blanket, a plastic tarp, two knives and a single rescue flare. They must use these items and their arsenal of skills to find shelter, build a fire and find food and water, all in sub-zero conditions.

Next, our survival experts take on a mountaineer's worst nightmare. They are left stranded on top of a mountain in New Zealand with limited supplies that would be carried by a climber: rope, crampons, an ice axe and other climbing gear. Working together, they battle 8,000-foot glacial peaks, deadly crevasses and deep rocky canyons as they trek down the mountain on a course set by Canterbury, an experienced climber. To find food, Lundin uses his knowledge of local cultures to tap the dietary wisdom of New Zealand's indigenous Maori.

Each year, an average of 20 people drown while cave diving. For this survival scenario, survival experts Cody and Dave are lost divers who are fortunate to find air, but they are deep inside a maze of caves in Belize. Equipped with only their dive gear — mask, fins, wetsuit, buoyancy compensator and flashlights — they must find their way out and to safety. The survival rules that work above ground, like following a river downstream, don't apply in the labyrinth of underground caves. Instead, they must make their way upstream in a trek that puts Cody's barefoot philosophy to the ultimate test. Once they emerge, the situation goes from bad to worse — they find themselves surrounded by dense jungle, a web of vines and thorn ravaged terrain... and snakes.

Cody and Dave head into Peru's infamous "Valley of the Volcanoes" to take on the ultimate lost-in-the-desert survival scenario — a broken down car miles from civilization, in the middle of an almost barren lava-scorched landscape. Here, Dave and Cody take on two roles to show how to survive this desolate location: Dave stays with the vehicle and signals for rescue while Cody heads out in search of water. But first, Dave and Cody strip the car for everything it's worth, salvaging the battery, headlights, electrical wiring, tires and seat cushions. They fight volcanic rock, heat exhaustion, altitude sickness,dehydration, rodents and a debilitating illness that literally brings Cody to his knees.

Dave and Cody take on a lost hiker scenario in the sweltering jungles of Laos

Survival experts Cody and Dave head to the heart of the Louisiana bayou to take on a potentially deadly scenario: lost in a 1,000 square mile labyrinth of water channels and bogs, home to 1.5 million alligators and six species of poisonous snakes.

Dave and Cody must trek through tough Arizona terrain to find each other before making their way back to civilization.

For two boat-wrecked hunters, surviving in the Pacific Northwest rainforest takes keen navigation skills and the know-how to avoid hypothermia and signal for rescue. Dave and Cody take on this nightmare scenario and show what it takes to survive.

Cody and Dave find survival resources in the trash in a hurricane's aftermath.

Code and Dave wade through piranha-infested water in Brazil's Pantanal.

Teti and Lundin are in a mangrove swamp in Sri Lanka.

Teti and Lundin are in the jungle of Sri Lanka.

Teti and Lundin are in the desert and mountains of Oman.

Teti and Lundin are in Norway. This is their final episode together.

The episode features footage from previous episodes, behind the scenes materials, and crew interviews.

Teti and Matt Graham in their first episode together in Panama

Teti and Graham are in Mayan underground tunnels.

Teti and Graham are 15,000 feet above sea level on a mountain ridgeline.

Teti and Graham are stranded deep in the jungle of Vietnam.

Teti and Graham are lost in New Zealand’s Fiordland

Somewhere in the Atlantic Ocean, Matt and Joe are caught in open water, where a nightmare scenario of a sunken ship is made worse by prowling sharks, razor sharp coral, unpredictable weather and false hope for rescue.

Matt and Joe take on one of the most common and deadly scenarios in the wilderness: an injury that requires medical intervention. Caught in a thick jungle, this worst-case becomes a test of will in the struggle to get out alive.

Joe and Matt take on an escape and evasion scenario on the border between Texas and Mexico. Here they confront the dangers of the wilderness without their knives, including being restrained with zip-ties, traveling solo and evading pursuit.

Joe & Matt face a journey of epic proportions in the Bolivian Andes. From the world’s largest salt flat 12,000 ft above sea level, through a desert with toxic water and into mountain peaks, they’re in a constant battle against dehydration & altitude.

Stranded in the scorching hot savannas of Southern Brazil, Naked and Afraid fan favorites EJ Snyder and Jeff Zausch must find a way to survive this bone-dry environment without water or food and navigate back to civilization.