As Celebrity Island with Bear Grylls continues its new series tonight and here's just how it's filmed and made.
This year's series airs its six-part series at 9PM on Channel 4, Sunday nights.
This year the celebrity group includes Academy Award and Golden Globe nominated actor, Eric Roberts, actor and musician, Martin Kemp, double Olympic gold medal rower, James Cracknell and Olympic boxer, Anthony Ogogo.
Joining them on the celebrity cast are TOWIE star, Pete Wicks, model and TV personality, Jo Wood, Love Island star Montana Brown, actress and radio broadcaster, Roxanne Pallett, journalist, presenter and transgender activist Paris Lees and TV doctor, Dr Saleyha Ahsan.
As with the civilian series of The Island, the Celebrity Island sees a number of contestants dropped off on an inhabited island.
Before the show kicked off, Bear and his team prepped the island to make sure that it could - in theory at least - support the contestants for the duration.
In past series, this has included adding extra wildlife and vegetation indigenous to the area including water sources, paca, turkeys, iguanas, caiman, boa constrictors, coconuts, sugar cane and yucca.
But Bear insists that it is still up to the Islanders to find these resources and exploit them.
The contestants are also provided with some starting supplies which typically include six knives, six machetes, fishing equipment, head torches, whistles, and a medical kit.
And before the show, the contestants were given a two day crash course in survival including basic first aid, lighting fires, water purification and the humane dispatch of animals. They also received basic health and safety training.
The Islanders also each have an emergency satellite phone plus GPS tracker to contact Bear and his team in case of real problems.
In addition, one of the contestants on The Island is a qualified doctor.
When it comes to how The Island is filmed, recording is undertaken completely by the contestants themselves using a range of equipment.
Alongside the celebs are four trained camera operators, taking part in the show like any other contestant.
But everyone had a go at shooting both with handheld cameras and GoPro cameras attached to them having been given some basic film training before starting.
The five weeks of footage was then edited to the show that airs on Channel 4 at 9PM, Sunday nights and online at All4.