71 Degrees North UK

The 10 celebrities taking on the toughest reality adventure ever arrive in the mountains of Central Norway.

The 9 remaining celebrities wake at base camp and Gavin and Diarmuid are chosen to lead the two teams north.

The celebrities trek up into the mountains where the equipment they need has been buried in a snow drift.

The celebrities must hike up a sheer cliff, then race to get a flag found at the summit of the opposite cliff.

The teams race to construct a traditional Norwegian tent, tomorrow they'll herd reindeer against the clock.

For the next 36 hours the four remaining celebrities will face their most physically punishing test yet.

Just 3 celebrities have made it all the way to the final leg, but only one of them will reach the North Cape.