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When early explorers happened upon this spot in 1841
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Secrets of the Underground

When early explorershappened upon this spot in 1841, they believed the hills were...

When early explorers
happened upon this spot in 1841, they believed the hills were ancient
Native American burial mounds, as they looked like others
found across the country, just on a much wider scale

Full Transcript

00:00:01.000 --> 00:00:05.004
When early explorers happened upon this spot in 1841,
00:00:05.012 --> 00:00:08.084
they believed the hills were ancient Native American burial mounds,
00:00:08.092 --> 00:00:11.004
as they looked like others found across the country,
00:00:11.048 --> 00:00:13.096
just on a much wider scale.
Duration
14 seconds
Views
17
Timestamp in Movie
00:24:42
Uploaded
Jul 13, 2025
Season
1
Episode
1
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 My gosh. This is a structure. - Secrets of the Underground 00:05
My gosh. This is a structure.
S01 • E02 Namely, why is there a sealed-off tunnel - Secrets of the Underground 00:06
Namely, why is there a sealed-off tunnel
S01 • E08 The site that we're looking at is possibly a ceremonial site. - Secrets of the Underground 00:06
The site that we're looking at is possibly a ceremonial...
S01 • E03 But there are fundamental differences between Lost Lake and Mountain Lake. - Secrets of the Underground 00:05
But there are fundamental differences between Lost Lake and ...
S01 • E07 That's what we saw right there. That was the window. - Secrets of the Underground 00:05
That's what we saw right there. That was the window.
S01 • E02 As it turns out, - Secrets of the Underground 00:08
As it turns out,
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 • 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 • E02 Now, as the rumour shows - Secrets of the Underground 00:09
Now, as the rumour shows