The Underground Eiger (1979)

A marvelous portrayal of a key event in British caving, and of the adventurous spirit of the two cavers famous for their numerous cave diving breakthroughs and records. Documenting a world record-breaking cave dive of 6,000 ft (1,800 m) made by Geoff Yeadon and Oliver Statham from West Kingsdale Master Cave, in North Yorkshire, England to Keld Head.

Unfortunately the movie The Underground Eiger is not yet available on HBO Max.