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So, there is still a debate about who built the mound and why
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Secrets of the Underground

So, there is still a debateabout who built the mound and why

So, there is still a debate
about who built the mound and why

Full Transcript

00:00:01.000 --> 00:00:05.000
So, there is still a debate about who built the mound and why.
Duration
5 seconds
Views
22
Timestamp in Movie
00:29:31
Uploaded
Jul 13, 2025
Season
1
Episode
2
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 ERT made headlines in 2016 - Secrets of the Underground 00:11
ERT made headlines in 2016
S01 • E03 You may not think of Virginia as a hotbed of seismic activity, - Secrets of the Underground 00:08
You may not think of Virginia as a hotbed of seismic activit...
S01 • E02 But two tribes are the most likely candidates. - Secrets of the Underground 00:04
But two tribes are the most likely candidates.
S01 • E07 The presence of A historic complex of ruins. - Secrets of the Underground 00:04
The presence of A historic complex of ruins.
S01 • E03 In fact, Central and Southwestern Virginia - Secrets of the Underground 00:08
In fact, Central and Southwestern Virginia
S01 • E08 You're saying that that area was not underwater 10,000 years ago? - Secrets of the Underground 00:05
You're saying that that area was not underwater 10,000 ...
S01 • E01 It's a great tool for our investigation - Secrets of the Underground 00:06
It's a great tool for our investigation
S01 • E02 They were hunter-gatherers who lived here from about 800BC to 1000AD. - Secrets of the Underground 00:07
They were hunter-gatherers who lived here from about 800BC t...
S01 • E07 Were they built by colonists, Native americans, - Secrets of the Underground 00:08
Were they built by colonists, Native americans,
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 • 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 • E03 So could these tremors be connected somehow - Secrets of the Underground 00:05
So could these tremors be connected somehow