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That's been the challenge for the last 200 years
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Secrets of the Underground

That's been the challengefor the last 200 years, trying to figure out whythe Serpent Mound...

That's been the challenge
for the last 200 years, trying to figure out why
the Serpent Mound was built

Full Transcript

00:00:01.000 --> 00:00:03.044
That's been the challenge for the last 200 years,
00:00:03.052 --> 00:00:06.016
trying to figure out why the Serpent Mound was built.
Duration
6 seconds
Views
20
Timestamp in Movie
00:29:11
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 • E08 Brian explains that when the glaciers from the last ice age began to melt, - Secrets of the Underground 00:07
Brian explains that when the glaciers from the last ice age ...
S01 • E02 It's probably the most well-known mound - Secrets of the Underground 00:07
It's probably the most well-known mound
S01 • E03 And it could be another clue about the disappearance of the lake. - Secrets of the Underground 00:05
And it could be another clue about the disappearance of the ...
S01 • E08 But when the melting ice exposed a new channel to the St Lawrence River, - Secrets of the Underground 00:08
But when the melting ice exposed a new channel to the St Law...
S01 • E01 Since the conductivity of various materials is different, - Secrets of the Underground 00:12
Since the conductivity of various materials is different,
S01 • E02 Several different native tribes - Secrets of the Underground 00:11
Several different native tribes
S01 • E07 Of this chamber Hovering in the sky above? - Secrets of the Underground 00:04
Of this chamber Hovering in the sky above?
S01 • E07 As the sun rises... Wow, look at that. - Secrets of the Underground 00:04
As the sun rises... Wow, look at that.
S01 • E03 It looks a little bit like the sides of some of the hills in the Grand Canyon. - Secrets of the Underground 00:05
It looks a little bit like the sides of some of the hills in...
S01 • E08 We know for sure that 10,500 years ago, - Secrets of the Underground 00:14
We know for sure that 10,500 years ago,
S01 • E02 So, there is still a debate about who built the mound and why. - Secrets of the Underground 00:05
So, there is still a debate about who built the mound and wh...
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,