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.

Genre:

Documentary

Seasons:

2

Episodes:

20

Cast:

Chris Jarman

Quality:

HD

Duration:

45 min

First Air:

2019

Rating:

6.5