In an old structurelike this prison basement, an air gap in the wallscould be one of many...
Join the conversation
Log in or create an account to leave a comment
Log In
In an old structure
like this prison basement, an air gap in the walls
could be one of many things
like this prison basement, an air gap in the walls
could be one of many things
Full Transcript
00:00:01.000 --> 00:00:03.004
In an old structure
like this prison basement,
00:00:03.048 --> 00:00:06.006
an air gap in the walls
could be one of many things.
Want This Clip in HD?
Upgrade for HD/4K downloads and unlimited access. Upgrade now →
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...
