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World's Biggest Cave

Premiere

Sat 10 Dec 9am - 10am National Geographic Channel
See Repeats
Sat 10 Dec, 10am - 11am National Geographic Channel +1
Sun 11 Dec, 3am - 4am National Geographic Channel
Sun 11 Dec, 4am - 5am National Geographic Channel +1
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Summary

Experts explore a cave in Vietnam that has been visited fewer times than the moon, finding subterranean rivers, isolated jungles and some of Earth's most well-preserved ecosystems.

Nature

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