Steve Backshall is one of our leading natural history broadcasters. He's also an extreme sportsman who has conquered some of the world's most dangerous mountains. Despite suffering a severe rock-climbing injury in 2008 he continues to set himself extraordinary challenges.
In this programme, he meets Leo Houlding. Leo is one of our greatest rock-climbers. He has free-climbed the world's most challenging peaks and is an experienced base-jumper. One of his greatest achievements was a successful expedition to tackle an unclimbed route on Ulvetanna - a fearsome tower of granite in eastern Antarctica.
Producer: Karen Gregor.