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Were they built by colonists, Native americans
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Secrets of the Underground

Were they built by colonists,Native americans, Or maybe even a mysterious groupOf medieval...

Were they built by colonists,
Native americans, Or maybe even a mysterious group
Of medieval settlers?

Full Transcript

00:00:01.000 --> 00:00:03.839
Were they built by colonists, Native americans,
00:00:03.084 --> 00:00:07.809
Or maybe even a mysterious group Of medieval settlers?
Duration
8 seconds
Views
19
Timestamp in Movie
00:29:43
Uploaded
Jul 13, 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 • E08 5,000 years ago, the water overran that site again - Secrets of the Underground 00:09
5,000 years ago, the water overran that site again
S01 • E02 They left behind numerous burial mounds across southern Ohio, - Secrets of the Underground 00:09
They left behind numerous burial mounds across southern Ohio...
S01 • E01 Clay materials are highly conductive, - Secrets of the Underground 00:08
Clay materials are highly conductive,
S01 • E03 And between 2005 and 2008, when the lake began to noticeably disappear, - Secrets of the Underground 00:13
And between 2005 and 2008, when the lake began to noticeably...
S01 • E07 To set up a simple test That might provide a key clue. - Secrets of the Underground 00:05
To set up a simple test That might provide a key clue.
S01 • E01 We'll put a stick in every 4'. OK. - Secrets of the Underground 00:04
We'll put a stick in every 4'. OK.
S01 • E07 My goodness. The sun goes in, - Secrets of the Underground 00:09
My goodness. The sun goes in,
S01 • E02 Was this their crowning achievement, - Secrets of the Underground 00:07
Was this their crowning achievement,
S01 • E08 It would have been a wonderful place for people to live - Secrets of the Underground 00:07
It would have been a wonderful place for people to live
S01 • E03 So could these tremors be connected somehow - Secrets of the Underground 00:05
So could these tremors be connected somehow
S01 • E01 56 metal electrodes will pass the current into the ground. - Secrets of the Underground 00:04
56 metal electrodes will pass the current into the ground.
S01 • E02 The common perception of pre-Columbian tribes - Secrets of the Underground 00:09
The common perception of pre-Columbian tribes
S01 • E08 It means that people could have put those stones there. - Secrets of the Underground 00:05
It means that people could have put those stones there.
S01 • E01 What I'm doing at the moment is adding benzonite, - Secrets of the Underground 00:07
What I'm doing at the moment is adding benzonite,
S01 • E03 Intriguingly, the ROV is now revealing - Secrets of the Underground 00:10
Intriguingly, the ROV is now revealing
S01 • E07 Literally fills with light Just days before christmas. - Secrets of the Underground 00:05
Literally fills with light Just days before christmas.
S01 • E08 We're at the very lip of a very steep embankment. - Secrets of the Underground 00:05
We're at the very lip of a very steep embankment.
S01 • E02 But, in fact, Native Americans, like Europeans, - Secrets of the Underground 00:07
But, in fact, Native Americans, like Europeans,
S01 • E01 It'll basically increase the conductivity, - Secrets of the Underground 00:11
It'll basically increase the conductivity,
S01 • E08 Lake Michigan is less than a quarter of a mile to our west. - Secrets of the Underground 00:05
Lake Michigan is less than a quarter of a mile to our west.