Other shows - Richard McCourt
Sub Zero (1999-2001)

BBC TWO.
Sub Zero was set in a bunker 10,000ft beneath the Earth's surface and challenged two teams of girls and boys (the XXs and the XYs, the chromosome patterns) to solve puzzles and perform tasks in order to collect Biospheres in order to purify the water in the post-apocalyptic bunker. The winners got a prize and survived, the losers got cryogenically frozen.

Each team was assisted by a celeb. They played (pretty much) the same challenges every week and the show was (mostly) live. Therefore the people at home could help their team to win the challenges.