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It looks like it could be a tunnel
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Secrets of the Underground

It looks like it could be a tunnel heading right towardsthe main cellblock

It looks like it could be a tunnel heading right towards
the main cellblock

Full Transcript

00:00:01.000 --> 00:00:02.092
It looks like it could be a tunnel
00:00:03.000 --> 00:00:06.032
heading right towards the main cellblock.
Duration
6 seconds
Views
16
Timestamp in Movie
00:16:30
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 • E03 After the person was dead, this would have shattered the skull. - Secrets of the Underground 00:05
After the person was dead, this would have shattered the sku...
S01 • E02 This tunnel is heading into the Downtown area, it seems like. - Secrets of the Underground 00:05
This tunnel is heading into the Downtown area, it seems like...
S01 • E01 If it was built originally to a certain thickness, - Secrets of the Underground 00:07
If it was built originally to a certain thickness,
S01 • E07 An imminent eruption scattered Throughout this valley, - Secrets of the Underground 00:06
An imminent eruption scattered Throughout this valley,
S01 • E08 Compiling the data gathered across the rec yard, - Secrets of the Underground 00:09
Compiling the data gathered across the rec yard,
S01 • E02 I'm wondering if it could connect the Capitol to more secret tunnels - Secrets of the Underground 00:10
I'm wondering if it could connect the Capitol to more s...
S01 • E03 But no, this just broke the skull, - Secrets of the Underground 00:07
But no, this just broke the skull,
S01 • E01 It's got multiple layers - Secrets of the Underground 00:05
It's got multiple layers
S01 • E07 Explosive volcanic eruption In north america. - Secrets of the Underground 00:04
Explosive volcanic eruption In north america.
S01 • E07 That mammoth blast 760,000 years ago. - Secrets of the Underground 00:05
That mammoth blast 760,000 years ago.
S01 • E01 So you can't tell if there's a staircase, - Secrets of the Underground 00:06
So you can't tell if there's a staircase,
S01 • E08 It appears as if the hollow pockets running through the rec yard - Secrets of the Underground 00:14
It appears as if the hollow pockets running through the rec ...
S01 • E07 Was so powerful, - Secrets of the Underground 00:10
Was so powerful,
S01 • E02 And if so, what exactly could they be for? - Secrets of the Underground 00:04
And if so, what exactly could they be for?
S01 • E03 It's 40% collagen, so when someone's hit on the head - Secrets of the Underground 00:08
It's 40% collagen, so when someone's hit on the he...
S01 • E01 It seems clear that at some point - Secrets of the Underground 00:09
It seems clear that at some point
S01 • E02 Just under where Stefan is standing, the tunnel ends at a wall. - Secrets of the Underground 00:05
Just under where Stefan is standing, the tunnel ends at a wa...
S01 • E03 ..the bone actually doesn't fracture or fall apart, it distorts. - Secrets of the Underground 00:06
..the bone actually doesn't fracture or fall apart, it ...
S01 • E07 Is just a small fraction Of that, - Secrets of the Underground 00:05
Is just a small fraction Of that,
S01 • E08 I came to Alcatraz very sceptical - Secrets of the Underground 00:07
I came to Alcatraz very sceptical