Challenge : build a raft capable of carrying two team members up & down a white-water course, avoiding rocks and capsizing. The team that completes the 3-lap course in the fastest time advances to the next round.

Contestants - 

Team Red : The Dukes Of Spook.
Team captain Dave Smith, Laura & Frenchy.
Expert : Chuck Ratley.

Team Blue Nasa's Rocket Men.
Team captain Mike, Jim & Tom.
Expert : Doug Riddle.