S1 E5: Borneo – Dark Shadow

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: 2/12/2020 | 0:48:00 | Expires: 3/10/2020
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