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Katsottavissa lauantai 5.9. klo 02:24 saakka

Rob Nelson uses state-of-the-art technology to search for rumored escape tunnels deep beneath Alcatraz. Also, a mysterious pattern of rocks is investigated at the bottom of Lake Michigan.

American Stonehenge

Scientist Rob Nelson investigates the world's strangest underground locations. He uses the latest technology and research to examine these mysteries.

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Secrets Of The Underground

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American Stonehenge

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