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You can look right down Into a cavity right down there
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Secrets of the Underground

You can look right downInto a cavity right down there

You can look right down
Into a cavity right down there

Full Transcript

00:00:01.000 --> 00:00:04.839
You can look right down Into a cavity right down there.
Duration
5 seconds
Views
15
Timestamp in Movie
00:24:28
Uploaded
Jul 09, 2025
Season
1
Episode
7
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 I'd searched for other lakes that might offer a clue - Secrets of the Underground 00:07
I'd searched for other lakes that might offer a clue
S01 • E08 If you don't go through Mark Holley, you don't see the site. - Secrets of the Underground 00:04
If you don't go through Mark Holley, you don't see...
S01 • E02 But I'm still not sure what it adds up to, - Secrets of the Underground 00:05
But I'm still not sure what it adds up to,
S01 • E07 Here, let's go down Right through here, - Secrets of the Underground 00:05
Here, let's go down Right through here,
S01 • E01 That might be a stretch, - Secrets of the Underground 00:06
That might be a stretch,
S01 • E03 Last winter, it was one-and-a-half times bigger than Mountain Lake, - Secrets of the Underground 00:09
Last winter, it was one-and-a-half times bigger than Mountai...
S01 • E08 Having granted me special access, - Secrets of the Underground 00:10
Having granted me special access,
S01 • E02 Then a friend texts me - Secrets of the Underground 00:11
Then a friend texts me
S01 • E01 When early explorers happened upon this spot in 1841, - Secrets of the Underground 00:14
When early explorers happened upon this spot in 1841,
S01 • E03 The reason? Multiple openings in the lake bed - Secrets of the Underground 00:07
The reason? Multiple openings in the lake bed
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