Hacker Cinema
Cities of the Underworld
2007 · TV series · documentary · 43 min episodes · 4 seasons
Don Wildman travels to the farthest and deepest reaches of the globe, using cutting-edge technology to explore mysteries buried deep underground.
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There was a TV series on the History channel that explored the subterranean environment and culture beneath various civilizations.
https://en.wikipedia.org/wiki/Cities_of_the_Underworld