2 Season
20 Episode
Underground Marvels - Season 2 Episode 2 Mystery of the Kentucky Cave
The longest known cave system in the world spans hundreds of miles beneath the hills of Kentucky, and containing prehistoric artifacts and ancient human remains, experts reveal a subterranean mystery that may have changed the course of U.S. history.
- Year : 2021
- Country : United Kingdom, United States of America
- Genre : Documentary
- Studio : Science, U&Yesterday
- Keyword :
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- Cast :
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