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.
| Title | Underground Marvels - Season 2 Episode 2 Mystery of the Kentucky Cave |
|---|---|
| Year | 2021 |
| Genre | Documentary |
| Country | United Kingdom, United States of America |
| Studio | Science, U&Yesterday |
| Cast | |
| Crew | |
| Alternative Titles | Underground Worlds |
| Keyword | |
| First Air Date | Oct 17, 2019 |
| Last Air date | Oct 07, 2021 |
| Season | 2 Season |
| Episode | 20 Episode |
| Runtime | 45:14 minutes |
| Quality | HD |
| IMDb: | 6.00/ 10 by 1.00 users |
| Popularity | 1.95 |
| Language | English |
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