https://www.youtube.com/watch?v=CNSsjiJG0qU

The underground city of Derinkuyu was carved into soft rock and was constructed as a haven for 20,000 people. However, some scholars contemplate that it was built to protect the ancient civilization from the Ice Age.

An exploration of the world’s most fascinating, strange and inexplicable mysteries. Scientists, historians, and witnesses share their voices as they seek to shed light on the impossible, the mysterious – and The UnXplained with William Shatner.

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