Overview: Dropped in to the middle of Mongolia's Gobi Desert, Ed tackles his most isolated challenge ever. Thousands of miles from civilisation, and facing the constant threats of searing heat and dehydration, Ed finds refuge in a desert oasis. Home to elusive desert bears, the oasis provides Ed with a source of water, edible plants and a base to make a rock and wood house. After a meagre start, he eventually catches some supper.