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Scientists believe it formed roughly 6,000 years ago
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Secrets of the Underground

Scientists believe itformed roughly 6,000 years ago when a feeder stream began tocollect...

Scientists believe it
formed roughly 6,000 years ago when a feeder stream began to
collect here in a natural pool
of water, forming a lake

Full Transcript

00:00:01.000 --> 00:00:03.092
Scientists believe it formed roughly 6,000 years ago
00:00:04.000 --> 00:00:08.006
when a feeder stream began to collect here in a natural pool of water, forming a lake.
Duration
9 seconds
Views
16
Timestamp in Movie
00:25:18
Uploaded
Jul 13, 2025
Season
1
Episode
3
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 • 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 • E07 That's maybe four feet wide In diameter, - Secrets of the Underground 00:07
That's maybe four feet wide In diameter,
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...
S01 • E03 At 3,800 feet above sea level, - Secrets of the Underground 00:07
At 3,800 feet above sea level,
S01 • E07 For any real purpose, - Secrets of the Underground 00:06
For any real purpose,
S01 • E08 So, I can't help but wonder, - Secrets of the Underground 00:05
So, I can't help but wonder,
S01 • E03 Most lakes in this region are much closer to sea level. - Secrets of the Underground 00:05
Most lakes in this region are much closer to sea level.
S01 • E02 It turns out that the first floor of the brothel was a restaurant - Secrets of the Underground 00:08
It turns out that the first floor of the brothel was a resta...
S01 • E08 But before I find out, it's time to cut the cameras. - Secrets of the Underground 00:04
But before I find out, it's time to cut the cameras.
S01 • E07 What was this Structure used for, - Secrets of the Underground 00:07
What was this Structure used for,
S01 • E03 So, the fact that this lake even exists here at all - Secrets of the Underground 00:06
So, the fact that this lake even exists here at all
S01 • E03 But the locals whose livelihoods have depended on it for decades - Secrets of the Underground 00:06
But the locals whose livelihoods have depended on it for dec...
S01 • E01 So could there be some other ceremonial or practical purpose - Secrets of the Underground 00:09
So could there be some other ceremonial or practical purpose
S01 • E02 The place did a brisk business, - Secrets of the Underground 00:08
The place did a brisk business,
S01 • E03 That's why when the water disappeared, - Secrets of the Underground 00:10
That's why when the water disappeared,
S01 • E08 I'm on a quest to investigate a mysterious pattern of rocks - Secrets of the Underground 00:10
I'm on a quest to investigate a mysterious pattern of r...
S01 • E02 So, Tracy believes they entered through more innocuous saloons - Secrets of the Underground 00:14
So, Tracy believes they entered through more innocuous saloo...