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Secrets of the Underground_peliplat
Secrets of the Underground_peliplat
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Secrets of the Underground (2017)

TV-PG (US) | USA | English | 60 min
6.5

Using cutting-edge technologies such as ground penetrating radar (GPR), LIDAR (Light Detection and Ranging), and 3-D imaging, scientists research fascinating underworlds of secret tunnel networks, ancient structures, and bizarre geological occurrences that offer glimpses into our history.

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just for fixed width,It is an identification bit and cannot be deleted!!!!!
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