That could represent an air gap,for sure, which is what a tunnel is, an air gap or a...
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That could represent an air gap,
for sure, which is what a tunnel is, an air gap or a void
under the surface
for sure, which is what a tunnel is, an air gap or a void
under the surface
Full Transcript
00:00:01.000 --> 00:00:05.068
That could represent an air gap,
for sure, which is what a tunnel is,
00:00:05.076 --> 00:00:07.092
an air gap or a void
under the surface.
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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...
