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This panel in the wall looks like a sealed door
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Secrets of the Underground

This panel in the walllooks like a sealed door and sounds hollow when I knock on it

This panel in the wall
looks like a sealed door and sounds hollow when I knock on it

Full Transcript

00:00:01.000 --> 00:00:03.008
This panel in the wall looks like a sealed door
00:00:03.016 --> 00:00:05.016
and sounds hollow when I knock on it.
Duration
5 seconds
Views
18
Timestamp in Movie
00:13:12
Uploaded
Jul 13, 2025
Season
1
Episode
1
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 There is a large resistive mass, - Secrets of the Underground 00:10
There is a large resistive mass,
S01 • E02 No-one would argue about saving money, but some say the cost-cutting - Secrets of the Underground 00:09
No-one would argue about saving money, but some say the cost...
S01 • E01 In 1981, a fire burned out the doors so they were no longer operational. - Secrets of the Underground 00:06
In 1981, a fire burned out the doors so they were no longer ...
S01 • E07 The base of the mountain Is covered in dense forest, - Secrets of the Underground 00:07
The base of the mountain Is covered in dense forest,
S01 • E08 Right next door to it is the prison recreation yard, - Secrets of the Underground 00:10
Right next door to it is the prison recreation yard,
S01 • E01 Could construction repairs have covered Capone's secret passageway? - Secrets of the Underground 00:05
Could construction repairs have covered Capone's secret...
S01 • E02 Based on what I've seen so far, - Secrets of the Underground 00:07
Based on what I've seen so far,
S01 • E01 Since we can't just tear open the wall, - Secrets of the Underground 00:05
Since we can't just tear open the wall,
S01 • E03 What else could it be besides a mass grave? - Secrets of the Underground 00:05
What else could it be besides a mass grave?
S01 • E08 Their ground penetrating radar scans revealed a sprawling set of anomalies - Secrets of the Underground 00:07
Their ground penetrating radar scans revealed a sprawling se...
S01 • E02 Any one of them could lead to a larger bunker or secret site. - Secrets of the Underground 00:05
Any one of them could lead to a larger bunker or secret site...
S01 • E01 I want to get some tech guys - Secrets of the Underground 00:06
I want to get some tech guys
S01 • E07 Within the span of a year, - Secrets of the Underground 00:07
Within the span of a year,
S01 • E02 It reminds me of pictures I've seen - Secrets of the Underground 00:05
It reminds me of pictures I've seen
S01 • E03 There are infinite other things that it could be, - Secrets of the Underground 00:08
There are infinite other things that it could be,
S01 • E08 Could those actually be tunnels that connect to the gaps we found behind the dungeon wall? - Secrets of the Underground 00:06
Could those actually be tunnels that connect to the gaps we ...
S01 • E01 I'm bringing in Brad Rister and his team of experts from GPR Engineering - Secrets of the Underground 00:08
I'm bringing in Brad Rister and his team of experts fro...
S01 • E07 We look like we're In a ghost forest right now. - Secrets of the Underground 00:05
We look like we're In a ghost forest right now.
S01 • E02 It was a four-storey shelter buried underground - Secrets of the Underground 00:08
It was a four-storey shelter buried underground
S01 • E08 I need to investigate the rec yard myself to get a closer look. - Secrets of the Underground 00:04
I need to investigate the rec yard myself to get a closer lo...