Dive deep into the underground maze of tunnels and chambers in the Cwmystwyth Lead Mine, unveiling secrets that have remained locked away for centuries.
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Experts uncover subterranean phenomena around the world, and share their impressive stories, unique origins and important roles in history, along with the secrets they still keep hidden underground.
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Hidden Mysteries of the Cwmystwyth Lead Mine | Underground Marvels | Science Channel
https://youtu.be/aIUIE07Y4jQ
