Yorkshire cameraman Sid Perou , who has travelled the globe on caving explorations, penetrates the mysterious world beneath the Pennines, and takes us where television has never been before. It's a world seen previously only by that exclusive and obsessive band of explorers - Britain's 20,000 cavers.
Lancaster Hole
The golden age of cave exploration falls well within living memory. Veteran Jim Eyres relives the last great Pennines discovery-miles of river-ways, caverns and grottos beneath the western dales.
Film editor MARTIN WINTERTON
Executive producer DOUGLAS B. SMITH