[ntrik]

You do realise that what Bear Grylls does is all for TV right? In a real survival situation I don't think he'd do half the things does in the show. Most of the time he is just demonstrating what you could do in the most extreme situations.

From the wikipedia page for SAS:

"If candidates have managed to pass through this combat phase then now they have to go through survival and escape and evasion training. In this phase candidates that are left from the hundreds that apply will undergo a survival phase in the jungle, in which they only have a small 'survival kit'. They must 'survive' for a week while evading a hunter force. This is a particularly hard phase because the hunter force is normally accustomed to the ground and are given rewards, such as increased leave, if they capture a candidate. After this week, the candidates must give themselves up at an agreed meeting point. They will then be taken back to the enemy HQ and interrogated. This interrogation phase will make or break their career as they must undergo physical and mental torture as well as aggressive interrogation. The SAS will accept roughly 2-7% of the soldiers who started selection."

You can't fake the SAS selection process.