The jungle of Guyana. The volunteers are spurred on by Mark Billingham, a jungle warfare instructor who served with special forces. They also face challenges inspired by a tribe of former cannibals.

Episode 1

Factual

Real Life

Unbreakable is a 2008 reality television series presented by explorer Benedict Allen on UK's Channel 5, where eight volunteers undergo an onslaught of physical and mental pressure in a bid to be declared unbreakable

Unbreakable

Series 1

8 volunteers undergo an onslaught of physical and mental pressure...

The volunteers are placed in the vicinity of a TNT explosion and forced to jump into an ice hole while still wearing their skis. They are required to dig a snow hole and sleep in it.

Episode 2

After a week's training in Portsmouth, the volunteers go aboard HMS Belfast on nearby Whale Island and face simulations of both a sinking under heavy gunfire and a terrifying helicopter crash.

Episode 3

The volunteers find themselves at the mercy of a former Foreign Legion instructor. Taking them into the Sahara, he subjects them to a series of gruelling challenges, including being buried alive.

Episode 4

The volunteers travel to Virginia to carry out "simulated" Navy SEAL training whose beach-based challenges from long beach runs to "surf torture" leave them physically and emotionally drained.

Episode 5

The volunteers will be sharing the territory with two million alligators and 60 species of venomous snake, and perhaps most formidable of all, their Native American guide.

Episode 6

The volunteers are required to take on the might of highly trained Zulu warriors in a series of stick-fighting contests.

Episode 7

The unbreakables are handed over to The South African Elite Fighting Force, ex-special forces instructors who teach African armies the reality of warfare.