For 12 well known celebrities it is time for a survivalist reality check'. '.strtoupper('n')otorious adventurer and survivalist bear grylls takes a top selection of celebrities, from both hollywood and the sporting world into the wild, to some of the most remote locations known to man, for a 48 hour journey of a lifetime'. '.strtoupper('e')ach celebrity will endure the harsh wilderness in high octane, action based and empowering journeys'. '.strtoupper('f')rom skydiving in the catskill mountains to rappelling down the cliffs of utah and battling torrential wind and rain in scotland, bear and the celebrity have to push both their minds and bodies to the limit, to successfully complete their journey.