Bear Grylls: Mission Survive

After eight days in the wild, the physical strain is taking its toll on the four remaining celebrities - but they know a place in the final is within reach. For their first task, they split into two teams and build rafts to get them safely across an estuary. However, the tide is coming in and with it the danger of a shark attack. Once across they each have to build their own shelter, to demonstrate what they have learnt from their experience, and are shocked by Bear's demonstration of how to stay hydrated when there is no clean water available. Will they take up the challenge to repeat his very personal method or walk?