A look at the science of survival. Including dramatic footage of the incident earlier this year in which Peter Snow and his team had just concluded filming an item in America about a system to avoid plane crashes when they were caught up in a real-life drama as their aircraft plunged to the ground. Plus a visit to the Alps to test the new breathing device designed to help victims of avalanches. See Choice. Producer Nathan Williams ; Editor Saul Nasse (S) (W) FOR INFORMATION: call [number removed]; Ceefax: page 623; Website: www.bbc.co.uk/tw