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The prison recreation yard is where subterranean air gaps
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Secrets of the Underground

The prison recreation yardis where subterranean air gaps were first detected bya team of...

The prison recreation yard
is where subterranean air gaps were first detected by
a team of scientists in 2013

Full Transcript

00:00:01.000 --> 00:00:03.084
The prison recreation yard is where subterranean air gaps
00:00:03.092 --> 00:00:07.008
were first detected by a team of scientists in 2013.
Duration
8 seconds
Views
34
Timestamp in Movie
00:09:06
Uploaded
Jul 13, 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 • E01 If, in theory, we could get through this wall, - Secrets of the Underground 00:06
If, in theory, we could get through this wall,
S01 • E02 But the airport isn't the only spot in Denver - Secrets of the Underground 00:07
But the airport isn't the only spot in Denver
S01 • E07 When magma moves up From the earth's core, - Secrets of the Underground 00:09
When magma moves up From the earth's core,
S01 • E08 If inmates burrowed underneath it, their trail would have started here. - Secrets of the Underground 00:05
If inmates burrowed underneath it, their trail would have st...
S01 • E01 GPR confirms it. There's empty space behind these two portals. - Secrets of the Underground 00:05
GPR confirms it. There's empty space behind these two p...
S01 • E02 There are rumours of a labyrinth leading to and from - Secrets of the Underground 00:07
There are rumours of a labyrinth leading to and from
S01 • E01 That means that if Capone escaped through these sewer tunnels, - Secrets of the Underground 00:09
That means that if Capone escaped through these sewer tunnel...
S01 • E07 In fact, that build-up Of pressure in the helium. - Secrets of the Underground 00:04
In fact, that build-up Of pressure in the helium.
S01 • E03 I'm exploring a stretch of woods known as Duffy's Cut, - Secrets of the Underground 00:09
I'm exploring a stretch of woods known as Duffy's ...
S01 • E02 Could these also be connected to the theories surrounding the airport? - Secrets of the Underground 00:05
Could these also be connected to the theories surrounding th...
S01 • E08 The rec yard is back that way - Secrets of the Underground 00:07
The rec yard is back that way
S01 • E01 So all he had to do was walk down from the lobby, like I did, - Secrets of the Underground 00:07
So all he had to do was walk down from the lobby, like I did...
S01 • E02 And perhaps even a network of subterranean super-bunkers? - Secrets of the Underground 00:05
And perhaps even a network of subterranean super-bunkers?
S01 • E07 I think we can say, Without much doubt, - Secrets of the Underground 00:05
I think we can say, Without much doubt,
S01 • E03 So far, a team of historians and scientists - Secrets of the Underground 00:11
So far, a team of historians and scientists
S01 • E08 All right, ready to get this powered up? Yep. - Secrets of the Underground 00:04
All right, ready to get this powered up? Yep.
S01 • E02 I'm gonna run a pair of high-tech experiments there - Secrets of the Underground 00:06
I'm gonna run a pair of high-tech experiments there
S01 • E08 Stefan and I are using a type of GPR - Secrets of the Underground 00:06
Stefan and I are using a type of GPR
S01 • E01 While Capone may have liked doing business at the Seelbach - Secrets of the Underground 00:12
While Capone may have liked doing business at the Seelbach
S01 • E02 How is there no map of the tunnel system here? - Secrets of the Underground 00:04
How is there no map of the tunnel system here?