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You'd never know these limestone caves lurk under Britain. This is extreme caving at its most demanding and dangerous. Cave divers, have at it!
This clip comes from Season 1, Episode 1: "Great Britain"
About "Underworld:"
Embark on a journey deep into the unknown 95% of our planet, revealing extraordinary caves with 3D laser-scanning technology.
Watch "Underworld" Fridays on EarthX.
1 min 19 sec
2025