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These are powerful enough to penetrate concrete
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Secrets of the Underground

These are powerful enoughto penetrate concrete, but anything buriedwill bounce the waves...

These are powerful enough
to penetrate concrete, but anything buried
will bounce the waves back to a receiver on the machine

Full Transcript

00:00:01.000 --> 00:00:03.064
These are powerful enough to penetrate concrete,
00:00:03.072 --> 00:00:05.096
but anything buried will bounce the waves back
00:00:06.004 --> 00:00:08.000
to a receiver on the machine.
Duration
8 seconds
Views
14
Timestamp in Movie
00:14:06
Uploaded
Jul 09, 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 • E07 Look at this. It's completely smooth bark. - Secrets of the Underground 00:04
Look at this. It's completely smooth bark.
S01 • E01 It can also be used on a macro scale, - Secrets of the Underground 00:11
It can also be used on a macro scale,
S01 • E07 This is completely pristine. - Secrets of the Underground 00:04
This is completely pristine.
S01 • E03 The site lies on private railroad property - Secrets of the Underground 00:08
The site lies on private railroad property
S01 • E02 Is there a map that I could look at to figure out - Secrets of the Underground 00:05
Is there a map that I could look at to figure out
S01 • E07 Now, the other thing That comes to mind is - Secrets of the Underground 00:07
Now, the other thing That comes to mind is
S01 • E02 To my knowledge, there's no comprehensive map - Secrets of the Underground 00:05
To my knowledge, there's no comprehensive map
S01 • E08 GPR does all the work for you, you just got to be able to interpret it. - Secrets of the Underground 00:05
GPR does all the work for you, you just got to be able to in...
S01 • E03 So we won't be able to confirm for sure - Secrets of the Underground 00:09
So we won't be able to confirm for sure
S01 • E01 Today, though, we'll use it to scan Capone's second-floor hideout, - Secrets of the Underground 00:18
Today, though, we'll use it to scan Capone's secon...
S01 • E07 When you have a fire, - Secrets of the Underground 00:07
When you have a fire,
S01 • E02 I don't know why there's not a map of the tunnel system, - Secrets of the Underground 00:07
I don't know why there's not a map of the tunnel s...
S01 • E03 Why would railroad officials try to conceal these 49 deaths - Secrets of the Underground 00:08
Why would railroad officials try to conceal these 49 deaths
S01 • E08 Each step you're taking is shooting out hundreds of data points - Secrets of the Underground 00:07
Each step you're taking is shooting out hundreds of dat...
S01 • E07 Would probably be completely Charred and burnt. - Secrets of the Underground 00:04
Would probably be completely Charred and burnt.
S01 • E02 So, we have a State Capitol with state-of-the-art heating, - Secrets of the Underground 00:08
So, we have a State Capitol with state-of-the-art heating,
S01 • E08 If these secret Spanish tunnels do exist, - Secrets of the Underground 00:06
If these secret Spanish tunnels do exist,
S01 • E03 According to the company's recently unearthed secret files, - Secrets of the Underground 00:12
According to the company's recently unearthed secret fi...
S01 • E07 As I wind my way through This haunting landscape, - Secrets of the Underground 00:07
As I wind my way through This haunting landscape,
S01 • E01 The lasers could damage our cameras, so we can't film the process. - Secrets of the Underground 00:06
The lasers could damage our cameras, so we can't film t...