Earth’s Underground Mysteries | The UnXplained (S6, E1) | Full Episode

By HISTORY

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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? See more in Season 6, Episode 1, "The World Beneath Our Feet." #TheUnXplained Subscribe for more from The UnXplained and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT Watch more The UnXplained on YouTube in this playlist: https://histv.co/UnXplainedYT Find out more about the show and watch full episodes on our site: https://histv.co/unxplained Check out exclusive The HISTORY Channel content: History Newsletter - https://histv.co/newsletter Website - https://histv.co/History Facebook - https://histv.co/Facebook Twitter - https://histv.co/Twitter From the producers of Ancient Aliens and The Curse of Oak Island comes The UnXplained, a one-hour, non-fiction series that explores the world’s most fascinating, strange and inexpl

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