How would you survive a rapid on the Amazon? Could you find your way out of a jungle with no map or compass? Or, indeed, could you survive in your own home if things went wrong?
Some of the challenges which the competing teams may have to tackle in this survival quiz.
Picking up the challenge this week are Lifeboatmen versus Lighthousekeepers.
Guest explorer, Sebastian Snow, puts real-life dilemmas to the teams. Other questions are set by Dennis Lever
Chris Brasher is in the Chair.
Programme devised and produced by Susan Snailum with Pat Taylor
(Revised repeat: Wed 11.5 am)