6.10/10 2010-06-27 52 minut.HDThe challenge is to build a powered craft to negotiate a stretch of white-water river. The craft must be powerful enough to get up the rapids but also have enough manoeuvrability to avoid treacherous rocks and to make a U-turn at the top of the course. Whoever sets the fastest single time in the course of three heats is the winner.Rok: 2010Studio: Channel 4Země: United Kingdom, United States of America