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I think those are utility pipes that were cut off,
probably 50 years ago
probably 50 years ago
Full Transcript
00:00:01.000 --> 00:00:02.068
I think those are utility pipes
00:00:02.076 --> 00:00:06.056
that were cut off,
probably 50 years ago.
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Movie Summary
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 g...