What happens when you put two complete strangers - sans clothes - in some of the most extreme environments on Earth? Each male-female duo is left with no food, no water, no clothes, and only one survival item each as they attempt to survive on their own.

A group of the best survival experts in the world take on an un-survivable situation: 40 days. 40 nights. No food, water or clothes. To survive they'll need to master the environment, pushing far beyond the breaking point. Will even one be able to finish?

Nine challengers are abandoned at a remote tropical island, with no maps or tools, miles away from civilization. In teams of three, they must swim to different ecosystems on the same island – sun-scorched beach, twisted mangrove swamp and dense jungle – to begin their distinct survival journeys.