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Mark and Hank suspect this rock formation may not only be man-made
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Secrets of the Underground

Mark and Hank suspect this rockformation may not only be man-made, but sacred, so they've...

Mark and Hank suspect this rock
formation may not only be man-made, but sacred, so they've kept
its location top-secret

Full Transcript

00:00:01.000 --> 00:00:04.092
Mark and Hank suspect this rock formation may not only be man-made,
00:00:05.000 --> 00:00:09.999
but sacred, so they've kept its location top-secret.
Duration
9 seconds
Views
11
Timestamp in Movie
00:24:55
Uploaded
Jul 12, 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 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 • E01 When the adventurers dug into them, though, - Secrets of the Underground 00:05
When the adventurers dug into them, though,
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,
S01 • E02 Yes, actually, this was the premier brothel. - Secrets of the Underground 00:04
Yes, actually, this was the premier brothel.
S01 • E02 This entire street was known as Holliday Street originally - Secrets of the Underground 00:11
This entire street was known as Holliday Street originally
S01 • E08 These are some pretty serious measures to protect a few submerged stones. - Secrets of the Underground 00:05
These are some pretty serious measures to protect a few subm...