Bear Grylls takes eight celebrities into the depths of one of the most unforgiving Central American rainforests, where they will be competing in a 12-day survival mission.Bear Grylls takes eight celebrities into the depths of one of the most unforgiving Central American rainforests, where they will be competing in a 12-day survival mission.Bear Grylls takes eight celebrities into the depths of one of the most unforgiving Central American rainforests, where they will be competing in a 12-day survival mission.