Britain's Lost World - Episode 2

Series exploring the remote and rocky islands of St Kilda, a UNESCO World Heritage Site. Kate Humble goes beneath the waves to find out how St Kilda's wildlife is faring underwater. Dan Snow investigates a World War II plane crash and attempts to trace the story of human habitation on the islands back beyond the Vikings. Meanwhile, Steve Backshall tries to find out who or what is harming the islands' most secretive inhabitant, the rare Leach's Storm-petrel.