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Before Alcatraz was a federal penitentiary
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Secrets of the Underground

Before Alcatraz wasa federal penitentiary, it was a military fortificationprotecting the...

Before Alcatraz was
a federal penitentiary, it was a military fortification
protecting the bay

Full Transcript

00:00:01.000 --> 00:00:03.048
Before Alcatraz was a federal penitentiary,
00:00:03.056 --> 00:00:07.024
it was a military fortification protecting the bay.
Duration
7 seconds
Views
16
Timestamp in Movie
00:18:36
Uploaded
Jul 08, 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 • E07 This could be a frightening sign That trouble is brewing. - Secrets of the Underground 00:04
This could be a frightening sign That trouble is brewing.
S01 • E02 Maybe let's go further down - Secrets of the Underground 00:05
Maybe let's go further down
S01 • E08 He tells me that these fortifications were built around 1860, - Secrets of the Underground 00:07
He tells me that these fortifications were built around 1860...
S01 • E07 Have often preceded Devastating eruptions. - Secrets of the Underground 00:04
Have often preceded Devastating eruptions.
S01 • E03 The thinking is, "Go after the intruders." - Secrets of the Underground 00:10
The thinking is, "Go after the intruders."
S01 • E07 The largest volcano on earth, Hawaii's mauna loa, - Secrets of the Underground 00:09
The largest volcano on earth, Hawaii's mauna loa,
S01 • E08 So, this is Alcatraz as it is today. - Secrets of the Underground 00:04
So, this is Alcatraz as it is today.
S01 • E01 We have to figure out what's below this. Mh-hm. - Secrets of the Underground 00:05
We have to figure out what's below this. Mh-hm.
S01 • E02 If I was testing a wall in a building, - Secrets of the Underground 00:05
If I was testing a wall in a building,
S01 • E08 Peter has been using old surveying data - Secrets of the Underground 00:07
Peter has been using old surveying data
S01 • E03 You suddenly get sick, so why not blame it, basically, - Secrets of the Underground 00:06
You suddenly get sick, so why not blame it, basically,
S01 • E07 Understanding these changes Helped volcanologists predict. - Secrets of the Underground 00:04
Understanding these changes Helped volcanologists predict.
S01 • E01 Now I want to trace this shaft down into the basement, - Secrets of the Underground 00:09
Now I want to trace this shaft down into the basement,
S01 • E07 Massive eruptions In 1975 and 1984. - Secrets of the Underground 00:06
Massive eruptions In 1975 and 1984.
S01 • E02 We gotta go downtown and see if we can find the tunnels there. There is definitely a connection. - Secrets of the Underground 00:06
We gotta go downtown and see if we can find the tunnels ther...
S01 • E03 An axe wound is an intense wound. Yeah. Yeah, super-violent crimes. - Secrets of the Underground 00:06
An axe wound is an intense wound. Yeah. Yeah, super-violent ...
S01 • E08 Meaning we can move not just through space, but through time. - Secrets of the Underground 00:05
Meaning we can move not just through space, but through time...
S01 • E02 I came to Denver thinking - Secrets of the Underground 00:10
I came to Denver thinking
S01 • E03 Janet believes the eight victims who may have tried to flee - Secrets of the Underground 00:07
Janet believes the eight victims who may have tried to flee
S01 • E08 To achieve this, he first has to line up the historical maps - Secrets of the Underground 00:07
To achieve this, he first has to line up the historical maps