Episode 5 Preview | Borneo – Dark Shadow
Preview: Season 1 Episode 5 | 30s | 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
