Four years ago, Daren Howarth and Adi Nortje moved from Brighton to Brittany to take on a huge life experiment. Their plan was to build an earth-sheltered home almost entirely from recycled materials, and to live the most sustainable lifestyle as possible. Based on ideas pioneered in the 1970s in New Mexico, their main building blocks were old tyres packed with rammed earth. But this very low tech house required lots of low tech energy to build it. To keep costs down Daren and Adi enlisted the help of a bunch of unskilled volunteers to help out, in exchange for teaching them the techniques. All very admirable, but with the main components of this build being rubbish and mud, the danger was that the project would end up looking like a hobbit house. Now that the work is finished Kevin returns to see whether their big life experiment has been a success.