Climbing psychologist Dr Rebecca Williams talks with veteran cave diver Geoff Yeadon and 8,000m peak climber Tamara Lunger about their attitude to risk, their motivation and how we can learn to manage the dangers faced in adventure sport. Followed later the same evening - feature film 'Diving into Darkness' An awe-inspiring odyssey about cave diving icon Jill Heinerth and her journey of exploration, resilience and self discovery into the planet's deepest depths.