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And these cycles effectively filter out the sediment
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Secrets of the Underground

And these cycles effectivelyfilter out the sediment that builds up on the bottom through...

And these cycles effectively
filter out the sediment that builds up on the bottom through its natural plumbing system
under the ridge

Full Transcript

00:00:01.000 --> 00:00:04.016
And these cycles effectively filter out the sediment
00:00:04.024 --> 00:00:05.006
that builds up on the bottom
00:00:05.068 --> 00:00:08.024
through its natural plumbing system under the ridge.
Duration
8 seconds
Views
14
Timestamp in Movie
00:43:26
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 • E01 But technology may finally be revealing - Secrets of the Underground 00:37
But technology may finally be revealing
S01 • E08 But our scientific analysis of this long-lost rock formation - Secrets of the Underground 00:08
But our scientific analysis of this long-lost rock formation
S01 • E02 Our scientific analysis of Serpent Mound has revealed secrets - Secrets of the Underground 00:09
Our scientific analysis of Serpent Mound has revealed secret...
S01 • E03 So the lodge has decided not to try to seal the leaks artificially, - Secrets of the Underground 00:08
So the lodge has decided not to try to seal the leaks artifi...
S01 • E08 Like the fact that the Great Lakes were once much smaller - Secrets of the Underground 00:05
Like the fact that the Great Lakes were once much smaller
S01 • E02 For starters, I was able to confirm that the mound - Secrets of the Underground 00:10
For starters, I was able to confirm that the mound
S01 • E08 That mastodons and people crossed paths - Secrets of the Underground 00:06
That mastodons and people crossed paths
S01 • E03 With a little luck, there still may be generations - Secrets of the Underground 00:06
With a little luck, there still may be generations
S01 • E08 And that our prehistoric ancestors had advanced strategies - Secrets of the Underground 00:08
And that our prehistoric ancestors had advanced strategies
S01 • E03 Mountain Lake has been hiding its secrets for centuries, - Secrets of the Underground 00:06
Mountain Lake has been hiding its secrets for centuries,
S01 • E02 Instead, this mound likely served a dual purpose - Secrets of the Underground 00:06
Instead, this mound likely served a dual purpose
S01 • E08 This curious collection of stones has preserved its secrets for millennia, - Secrets of the Underground 00:08
This curious collection of stones has preserved its secrets ...
S01 • E02 It was a tribute to the serpent god they revered, - Secrets of the Underground 00:12
It was a tribute to the serpent god they revered,
S01 • E01 The Mima Mounds have preserved their secrets for millennia. - Secrets of the Underground 00:04
The Mima Mounds have preserved their secrets for millennia.
S01 • E02 The Serpent Mound has hidden its secrets for centuries... - Secrets of the Underground 00:05
The Serpent Mound has hidden its secrets for centuries...