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This Upside Down Cave Is a Microscopic Warzone

From PBS NATURE and Atlas Obscura, Untold Earth is a documentary series dedicated to unpacking the stories behind North America’s strangest, most unique natural wonders.

This Upside Down Cave Is a Microscopic Warzone

Season 1 Episode 9 | 5m 57s | CC

Below the Chihuahuan Desert in southeastern New Mexico, lies an extensive system of limestone caves, among them the famed Carlsbad Cavern, home to one of North America's largest underground chambers. But there is more to this subterranean world than gigantic geological formations. It is also ground zero for a microbial war that’s been raging for thousands of years, right beneath our feet.

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