There are no visual pointsof reference to the surface and GPS won't work down here at all
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There are no visual points
of reference to the surface and GPS won't work down here at all
of reference to the surface and GPS won't work down here at all
Full Transcript
00:00:01.000 --> 00:00:03.088
There are no visual points
of reference to the surface
00:00:03.096 --> 00:00:07.012
and GPS won't work down here at all.
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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...
