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Season 1 Episode 5 | 48m | Video has closed captioning.
Follow Steve Backshall as he drops down a sinkhole to explore a series of underground Bornean caves threatened by deforestation and limestone quarrying. The journey may lead to the potential to explore other undiscovered subterranean worlds.
Aired: 02/12/20
Expires: 01/14/24
Q&A
Steve Backshall takes PBS behind his adventures, explains how the expeditions are chosen, and explores our role in protecting these magnificent locations.
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