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Humanity has launched satellites into outer space and submarines to the ocean floor, but the ground below Earth's surface remains shrouded in mystery. Are there profound secrets buried beneath layers of rock, or hidden in vast caves? Can the subterranean world below shed light on humanity's past, or even its future?
First Air Date : Jul 19, 2019
Last Air date : Dec 22, 2023
Episode : 83 Episode
Season : 6 Season
Runtime: 43 minutes
Studio: History
Country: United States of America
Cast: William Shatner, Tok Thompson
Crew:
