 This is Robert McFarlane talking with Steve Paulson, who is just a teensy bit claustrophobic. So we went for a day's caving down something called Giant's Hole. This is like a beginner's caving expedition, but it's famous for being very exciting. And there's something called the Crab Walk in it, this water-worn rift of limestone that folds like a curtain. And it reaches a point called the Vice.