The golden age of cave exploration falls well within living memory. Veteran caver Jim Eyres, of the British Speleological Association, relives the last great Pennines discovery - the Lancaster Hole - which allowed access to miles of river-ways, caverns and grottos beneath the western dales.
| Actor | Role |
|---|---|
| JJim EyresSelf | Self |
| GGeorge CornesSelf | Self |
| RRon BlissSelf | Self |
| KKen CooperNarrator | Narrator |