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(DEEPER THUDDING SOUNDS)
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Secrets of the Underground

(DEEPER THUDDING SOUNDS) (HOLLOW BANGING SOUNDS) Sounds hollow, right?

(DEEPER THUDDING SOUNDS) (HOLLOW BANGING SOUNDS) Sounds hollow, right?

Full Transcript

00:00:01.000 --> 00:00:02.052
(DEEPER THUDDING SOUNDS)
00:00:02.006 --> 00:00:04.016
(HOLLOW BANGING SOUNDS)
00:00:04.024 --> 00:00:06.056
Sounds hollow, right?
Duration
7 seconds
Views
16
Timestamp in Movie
00:17:31
Uploaded
Jul 08, 2025
Season
1
Episode
2
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 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...
S01 • E01 Each modest-looking home had a bathtub - Secrets of the Underground 00:05
Each modest-looking home had a bathtub
S01 • E02 By sending a sound wave into the wall and reading the echo, - Secrets of the Underground 00:09
By sending a sound wave into the wall and reading the echo,
S01 • E08 This is exactly what I've been looking for, - Secrets of the Underground 00:07
This is exactly what I've been looking for,
S01 • E01 The tunnels linked up with the public sewage system, - Secrets of the Underground 00:15
The tunnels linked up with the public sewage system,