Actor and comedian Rob Brydon steps out of the limelight and into the wild as he attempts to survive two days in the wilderness of Snowdonia with Bear Grylls. Rob and Bear travel by helicopter to a lake nestled between disused slate mines and mountains, before jumping 30 feet into the freezing water. Climbing out of the lake, the pair next abseil down a 200-foot deep sinkhole - a descent that would be challenging for even a seasoned climber. Bear then challenges Rob to set up a shelter on rocky grass in the skeleton of a former miner's cottage in an abandoned village. Finally after a cold night on the hillside, the duo travel by the light of burning torches deep inside an old mine before attempting to escape up a treacherous mine shaft. Does Rob have the energy to climb out or has he reached his limit?