Explorer Benedict Allen presents this new adventure series. Filmed across four continents, from the Norwegian arctic to the Sahara Desert, eight volunteers undergo an onslaught of physical and mental pressure in a bid to be declared "unbreakable".
In the opener, the hardy participants contend with the heat, humidity and wildlife of the Amazonian jungle. They must endure tribal rituals, survive a gruelling run, wrestle an anaconda and wade through piranha-infested water.
They will be bossed and cajoled by physical trainers and survival experts as they bid to outdo - and outlast - each other. But who will have what it takes?
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