大象传媒

Five young British men take on the challenge of a lifetime - to spend four months travelling the world, taking on some of the most deadly creatures and hostile places on the planet.

The adventurers head into the jungle of Mexico's Yucatan peninsula and become cave-divers in a vast network of largely uncharted, pitch-black, underwater tunnels.

The Yucatan was once a centre of the Mayan empire, and the openings to this watery underworld were sacred. Deep in one of the caverns, close to an ancient temple, a Mayan graveyard contains suspected victims of human sacrifice. The boys have just six days to prove themselves to their trainer for the week, top cave-diver Sam Meacham. If they do, they will assist him in an archaeological expedition to explore this mysterious site.

For cave-divers death is an ever-present threat and the boys will have to show they can overcome extreme claustrophobia, intense scuba diving drills and an ability to never panic. After failures in Ecuador and Siberia, Ben and Easton are desperate to complete a challenge, but it looks like the smart money is on top watersports athlete Ross for this one.