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As it turns out
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Secrets of the Underground

As it turns out, the secret passageway isa little-known remnant of the...

As it turns out, the secret passageway is
a little-known remnant of the neighbourhood's
notorious past

Full Transcript

00:00:01.000 --> 00:00:02.032
As it turns out,
00:00:02.004 --> 00:00:04.088
the secret passageway is a little-known remnant
00:00:04.096 --> 00:00:07.084
of the neighbourhood's notorious past.
Duration
8 seconds
Views
17
Timestamp in Movie
00:24:51
Uploaded
Jul 12, 2025
Season
1
Episode
2
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 Lost Lake goes through the same cycle every year. - Secrets of the Underground 00:04
Lost Lake goes through the same cycle every year.
S01 • E07 As I explore This bizarre structure, - Secrets of the Underground 00:06
As I explore This bizarre structure,
S01 • E08 Mark and Hank suspect this rock formation may not only be man-made, - Secrets of the Underground 00:09
Mark and Hank suspect this rock formation may not only be ma...
S01 • E01 When the adventurers dug into them, though, - Secrets of the Underground 00:05
When the adventurers dug into them, though,
S01 • E03 The plug holes are lava tubes thousands of years old - Secrets of the Underground 00:07
The plug holes are lava tubes thousands of years old
S01 • E02 This was built in 1889 by a madam named Jennie Rogers. - Secrets of the Underground 00:05
This was built in 1889 by a madam named Jennie Rogers.
S01 • E01 So the mounds don't appear to be graves. - Secrets of the Underground 00:04
So the mounds don't appear to be graves.
S01 • E07 And it's not long before I Uncover an even stranger detail. - Secrets of the Underground 00:06
And it's not long before I Uncover an even stranger det...
S01 • E03 In winter, there's enough rain and snowfall to balance - Secrets of the Underground 00:06
In winter, there's enough rain and snowfall to balance
S01 • E02 And if you look up here at the top, - Secrets of the Underground 00:05
And if you look up here at the top,
S01 • E02 At the very, very top, - Secrets of the Underground 00:05
At the very, very top,
S01 • E08 And just to be clear, guys, it's gonna be the crew and everybody. - Secrets of the Underground 00:04
And just to be clear, guys, it's gonna be the crew and ...
S01 • E07 What we're looking at here Is a tiny crawl space, - Secrets of the Underground 00:08
What we're looking at here Is a tiny crawl space,
S01 • E01 Walking up, down and around these hills - Secrets of the Underground 00:07
Walking up, down and around these hills
S01 • E02 Now, as the rumour shows - Secrets of the Underground 00:09
Now, as the rumour shows
S01 • E03 But Mountain Lake never fluctuated like this, at least in recent memory, - Secrets of the Underground 00:08
But Mountain Lake never fluctuated like this, at least in re...
S01 • E03 Scientists believe it formed roughly 6,000 years ago - Secrets of the Underground 00:09
Scientists believe it formed roughly 6,000 years ago
S01 • E07 That's maybe four feet wide In diameter, - Secrets of the Underground 00:07
That's maybe four feet wide In diameter,
S01 • E08 Mark even makes us surrender our cellphones at the dock - Secrets of the Underground 00:08
Mark even makes us surrender our cellphones at the dock
S01 • E01 Like the Cahokia mounds in Illinois, - Secrets of the Underground 00:24
Like the Cahokia mounds in Illinois,