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We now know there are air gaps under the rec yard
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Secrets of the Underground

We now know there are air gapsunder the rec yard and behind the cellblock wall

We now know there are air gaps
under the rec yard and behind the cellblock wall

Full Transcript

00:00:01.000 --> 00:00:04.081
We now know there are air gaps under the rec yard
00:00:04.161 --> 00:00:06.004
and behind the cellblock wall.
Duration
6 seconds
Views
23
Timestamp in Movie
00:17:22
Uploaded
Jul 12, 2025
Season
1
Episode
8
Genres
documentary

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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...
S01 • E08 But the GPR data didn't give us enough detail - Secrets of the Underground 00:06
But the GPR data didn't give us enough detail
S01 • E01 It may sound like the stuff of Hollywood movies, - Secrets of the Underground 00:09
It may sound like the stuff of Hollywood movies,
S01 • E03 Physical evidence of a mass murder in Pennsylvania - Secrets of the Underground 00:08
Physical evidence of a mass murder in Pennsylvania
S01 • E02 (DEEPER THUDDING SOUNDS) - Secrets of the Underground 00:07
(DEEPER THUDDING SOUNDS)
S01 • E08 So, I've got to find some other way at peering underneath Alcatraz - Secrets of the Underground 00:09
So, I've got to find some other way at peering undernea...
S01 • E01 Since ancient times, catacombs in Rome and Paris - Secrets of the Underground 00:10
Since ancient times, catacombs in Rome and Paris
S01 • E07 From this vantage point, - Secrets of the Underground 00:04
From this vantage point,
S01 • E02 I want to know if the tunnel we're in continues beyond this wall - Secrets of the Underground 00:06
I want to know if the tunnel we're in continues beyond ...
S01 • E08 While digging for new research about Alcatraz, - Secrets of the Underground 00:08
While digging for new research about Alcatraz,
S01 • E07 Over the last 20 years or so. - Secrets of the Underground 00:04
Over the last 20 years or so.
S01 • E02 Because if it does, that could lend credence to the rumours - Secrets of the Underground 00:07
Because if it does, that could lend credence to the rumours
S01 • E01 And even in our time, infamous Mexican drug lord El Chapo Guzman - Secrets of the Underground 00:12
And even in our time, infamous Mexican drug lord El Chapo Gu...
S01 • E07 Insar, or interferometric Synthetic aperture radar, - Secrets of the Underground 00:08
Insar, or interferometric Synthetic aperture radar,
S01 • E08 Peter has been using cutting-edge technology - Secrets of the Underground 00:07
Peter has been using cutting-edge technology
S01 • E03 As Janet explains, - Secrets of the Underground 00:08
As Janet explains,
S01 • E02 It looks like it was designed as a barrier to block the tunnel. - Secrets of the Underground 00:04
It looks like it was designed as a barrier to block the tunn...
S01 • E08 These brand-new maps can dissect the complex layers of history - Secrets of the Underground 00:09
These brand-new maps can dissect the complex layers of histo...
S01 • E07 Of radiation on the target, - Secrets of the Underground 00:06
Of radiation on the target,
S01 • E02 To find out, we're going to use what's called sonic echo testing. - Secrets of the Underground 00:05
To find out, we're going to use what's called soni...
S01 • E03 Basically, what's happening is these Irish folks come into town, - Secrets of the Underground 00:07
Basically, what's happening is these Irish folks come i...