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Instead, they were most likely gaps between Civil War era fortifications
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Secrets of the Underground

Instead, they were most likely gapsbetween Civil War era fortifications, filled over...

Instead, they were most likely gaps
between Civil War era fortifications, filled over during construction
of the prison rec yard

Full Transcript

00:00:01.000 --> 00:00:05.044
Instead, they were most likely gaps between Civil War era fortifications,
00:00:05.052 --> 00:00:08.032
filled over during construction of the prison rec yard.
Duration
8 seconds
Views
15
Timestamp in Movie
00:21:13
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 • E01 There's like a little gap, not very big, maybe 2', - Secrets of the Underground 00:06
There's like a little gap, not very big, maybe 2',
S01 • E03 Evaporation alone could never account for such a dramatic drop, - Secrets of the Underground 00:08
Evaporation alone could never account for such a dramatic dr...
S01 • E01 I'll put the GoProbe up there so you guys can see what it looks like. - Secrets of the Underground 00:05
I'll put the GoProbe up there so you guys can see what ...
S01 • E08 Though I was sceptical at first, - Secrets of the Underground 00:09
Though I was sceptical at first,
S01 • E02 ..not just dirt, we've got a ceiling made of wood, - Secrets of the Underground 00:09
..not just dirt, we've got a ceiling made of wood,
S01 • E01 We're going up inside... inside the ceiling. - Secrets of the Underground 00:05
We're going up inside... inside the ceiling.
S01 • E07 There are smaller, Satellite ones around the area. - Secrets of the Underground 00:05
There are smaller, Satellite ones around the area.
S01 • E03 This right here is the little section of water that remains of this lake, - Secrets of the Underground 00:07
This right here is the little section of water that remains ...
S01 • E08 That they had built a secret network of escape tunnels - Secrets of the Underground 00:07
That they had built a secret network of escape tunnels
S01 • E01 From downstairs up, up, up, up, up, - Secrets of the Underground 00:07
From downstairs up, up, up, up, up,
S01 • E07 Aren't the prelude to another Supervolcanic eruptions, - Secrets of the Underground 00:07
Aren't the prelude to another Supervolcanic eruptions,
S01 • E02 I think if we removed this door, it would collapse for sure. - Secrets of the Underground 00:05
I think if we removed this door, it would collapse for sure.
S01 • E03 It's almost hard to imagine that 80ft over our head - Secrets of the Underground 00:08
It's almost hard to imagine that 80ft over our head
S01 • E08 But it appears there was no way out underground after all. - Secrets of the Underground 00:04
But it appears there was no way out underground after all.
S01 • E01 He was said to stand around 5'10" and weigh as much as 260lbs. - Secrets of the Underground 00:05
He was said to stand around 5'10" and weigh as muc...
S01 • E08 So that must be why the only prisoners ever to escape from The Rock - Secrets of the Underground 00:07
So that must be why the only prisoners ever to escape from T...
S01 • E07 Because as we've seen, - Secrets of the Underground 00:05
Because as we've seen,
S01 • E02 It's filled in with cobblestone and sandy dirt, - Secrets of the Underground 00:08
It's filled in with cobblestone and sandy dirt,
S01 • E03 This is like basically at the bottom of where the old lake was. - Secrets of the Underground 00:06
This is like basically at the bottom of where the old lake w...
S01 • E01 It would have been especially tight for someone the size of Capone, - Secrets of the Underground 00:07
It would have been especially tight for someone the size of ...