A through trip down Simpson Pot and out of the Valley Entrance of Kingsdale Master Cave. Filmed over a dozen trips, it features cavers from the Happy Wanderers Cave and Pothole Club. It was commissioned by BBC Leeds, and was first broadcast on BBC One in October 1972.
| Actor | Role |
|---|---|
 Bill GrundyNarrator (voice) | Narrator (voice) |
| JJack PickupNot listed | Not listed |
| LLeslie AlvinsonNot listed | Not listed |
| JJohn ShepherdNot listed | Not listed |
| JJohn RussomNot listed | Not listed |
| DDave CobleyNot listed | Not listed |