6.10/10 2010-06-27 52 minutes.HDThe challenge is to build a one-man snowmobile. The test course, in the Mammoth Mountains, northern California, is circular with a 300-metre diameter. Each team has 10 minutes; the winner is the team whose snowmobile covers the most ground. In the event of breakdown, they'll be allowed to do repairs and restart twice.Year: 2010Studio: Channel 4Country: United Kingdom, United States of America