33K views · 486 reactions | A cave exploration team discovered a giant sinkhole in Leye County, China. See the ancient trees growing out of the well-preserved forest. https://cnn.it/39CNpAi | CNN | Facebook

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