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A receiver above ground uses those waves
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Secrets of the Underground

A receiver above grounduses those waves to locate exactlywhere the sonde is beneath it

A receiver above ground
uses those waves to locate exactly
where the sonde is beneath it

Full Transcript

00:00:01.000 --> 00:00:03.032
A receiver above ground uses those waves
00:00:03.004 --> 00:00:06.052
to locate exactly where the sonde is beneath it.
Duration
7 seconds
Views
16
Timestamp in Movie
00:15:23
Uploaded
Jul 13, 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 • E03 And she's sceptical that all 57 workers who went missing - Secrets of the Underground 00:07
And she's sceptical that all 57 workers who went missin...
S01 • E07 Normally, we're at about 350 parts per million. - Secrets of the Underground 00:05
Normally, we're at about 350 parts per million.
S01 • E02 All right, Rob, I'm heading upstairs. Let's see what we can find. - Secrets of the Underground 00:05
All right, Rob, I'm heading upstairs. Let's see wh...
S01 • E03 In the 1830s, cholera's fatality rate was about 60%. - Secrets of the Underground 00:06
In the 1830s, cholera's fatality rate was about 60%.
S01 • E08 I'm in the rec yard of the infamous Alcatraz prison - Secrets of the Underground 00:08
I'm in the rec yard of the infamous Alcatraz prison
S01 • E01 Essentially it's allowing us to pinpoint our investigation - Secrets of the Underground 00:13
Essentially it's allowing us to pinpoint our investigat...
S01 • E07 It's going up more, More, and more. - Secrets of the Underground 00:05
It's going up more, More, and more.
S01 • E02 Stefan, you just let me know when you're outside of the building, over. - Secrets of the Underground 00:05
Stefan, you just let me know when you're outside of the...
S01 • E03 It really cannot be spontaneous, simultaneous death - Secrets of the Underground 00:09
It really cannot be spontaneous, simultaneous death
S01 • E08 And our ground penetrating radar - Secrets of the Underground 00:06
And our ground penetrating radar
S01 • E07 That this volcano Is about to blow? - Secrets of the Underground 00:04
That this volcano Is about to blow?
S01 • E02 I'm going to use the sonde technology - Secrets of the Underground 00:07
I'm going to use the sonde technology
S01 • E03 It can't be, or it would have a mortality from cholera - Secrets of the Underground 00:08
It can't be, or it would have a mortality from cholera
S01 • E07 And obviously, the c.O.2 Has killed all the trees. - Secrets of the Underground 00:05
And obviously, the c.O.2 Has killed all the trees.
S01 • E01 The Lidar revealed exactly where I need to search - Secrets of the Underground 00:09
The Lidar revealed exactly where I need to search
S01 • E02 Go ahead and set that sonde and I'll start looking, over. - Secrets of the Underground 00:04
Go ahead and set that sonde and I'll start looking, ove...
S01 • E08 That could represent an air gap, for sure, which is what a tunnel is, - Secrets of the Underground 00:08
That could represent an air gap, for sure, which is what a t...
S01 • E03 In fact, Janet suspects - Secrets of the Underground 00:06
In fact, Janet suspects
S01 • E07 I think I probably should Get back to the car. - Secrets of the Underground 00:04
I think I probably should Get back to the car.
S01 • E08 Right now it looks like we're looking at an arch - Secrets of the Underground 00:13
Right now it looks like we're looking at an arch