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Today, I'm betting GPR can help us
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Secrets of the Underground

Today, I'm betting GPR can help us find any hidden passageways ortunnels that could have...

Today, I'm betting GPR can help us find any hidden passageways or
tunnels that could have offered desperate inmates a hope of escape

Full Transcript

00:00:01.000 --> 00:00:02.092
Today, I'm betting GPR can help us
00:00:03.000 --> 00:00:06.000
find any hidden passageways or tunnels that could have offered
00:00:06.008 --> 00:00:08.056
desperate inmates a hope of escape.
Duration
9 seconds
Views
16
Timestamp in Movie
00:03:06
Uploaded
Jul 10, 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 • E02 I know that's not gonna help our case - Secrets of the Underground 00:06
I know that's not gonna help our case
S01 • E01 The title character was based on the real-life gangsters he saw here, - Secrets of the Underground 00:09
The title character was based on the real-life gangsters he ...
S01 • E03 So, this whole thing goes back to an incident that happened - Secrets of the Underground 00:06
So, this whole thing goes back to an incident that happened
S01 • E02 So, this clearly isn't the first time Heath has heard these questions. - Secrets of the Underground 00:05
So, this clearly isn't the first time Heath has heard t...
S01 • E03 What we know here is that a total of 57 Irish railroad workers - Secrets of the Underground 00:10
What we know here is that a total of 57 Irish railroad worke...
S01 • E01 In the Prohibition era of the 1920s, - Secrets of the Underground 00:07
In the Prohibition era of the 1920s,
S01 • E08 My first stop is the main cellblock, - Secrets of the Underground 00:06
My first stop is the main cellblock,
S01 • E02 After all, strict access procedures are now in place - Secrets of the Underground 00:07
After all, strict access procedures are now in place
S01 • E01 After picking up a new supply of bourbon and moonshine, - Secrets of the Underground 00:08
After picking up a new supply of bourbon and moonshine,
S01 • E08 Meeting me there is Alcatraz historian John Martini. - Secrets of the Underground 00:05
Meeting me there is Alcatraz historian John Martini.
S01 • E03 And we're at the site of the most difficult mile in that entire system. - Secrets of the Underground 00:04
And we're at the site of the most difficult mile in tha...
S01 • E02 But I have to wonder, - Secrets of the Underground 00:11
But I have to wonder,
S01 • E01 From here, cash and contraband were allegedly funnelled underground, - Secrets of the Underground 00:08
From here, cash and contraband were allegedly funnelled unde...
S01 • E03 In 1832, a contractor named Philip Duffy - Secrets of the Underground 00:07
In 1832, a contractor named Philip Duffy
S01 • E01 This is the legend. But did it really happen? - Secrets of the Underground 00:04
This is the legend. But did it really happen?
S01 • E02 In my research, I discovered some odd facts about Denver International. - Secrets of the Underground 00:06
In my research, I discovered some odd facts about Denver Int...
S01 • E03 The area's hilly terrain made it one of the railroad's toughest stretches. - Secrets of the Underground 00:05
The area's hilly terrain made it one of the railroad�...
S01 • E08 Since the mid-19th century, Alcatraz has been synonymous with outlaws. - Secrets of the Underground 00:05
Since the mid-19th century, Alcatraz has been synonymous wit...
S01 • E02 Facts that have fuelled rumours - Secrets of the Underground 00:06
Facts that have fuelled rumours
S01 • E03 To build what came to be known as Duffy's Cut, - Secrets of the Underground 00:06
To build what came to be known as Duffy's Cut,