Borneo – Dark Shadow

Episode 5 | 48m

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: 03/11/20

Rating: TV-PG

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