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We think of ourselves as a global species. But in fact we can only comfortably survive on less than a quarter of the Earth’s surface. Dr Kevin Fong – Specialist in the limits of the human body - sets out to discover how we are able to conquer the other 75%. In an eye-popping series of experiments, Dr Fong uses his own body to demonstrate how unsuited our biology is to much of the planet – and how we have had to develop the technology to let us survive there. In this first programme, about how to survive underwater, Dr Fong escapes from a sinking helicopter, walks through a tank of sharks in an antique diving suit and intentionally gives himself nitrogen narcosis. This trail also shows some tantalising snippets of what Kevin gets up to in the next episode – Up.