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It's basically a rubble pile that continually is
getting clogged and unclogged
getting clogged and unclogged
Full Transcript
00:00:01.000 --> 00:00:02.092
It's basically a rubble pile
00:00:03.000 --> 00:00:05.006
that continually is
getting clogged and unclogged.
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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...