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ERT is an advanced subsurface imaging technique
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Secrets of the Underground

ERT is an advanced subsurfaceimaging technique that allows us to see hundredsof feet below...

ERT is an advanced subsurface
imaging technique that allows us to see hundreds
of feet below the surface

Full Transcript

00:00:01.000 --> 00:00:03.008
ERT is an advanced subsurface imaging technique
00:00:03.088 --> 00:00:07.002
that allows us to see hundreds of feet below the surface.
Duration
7 seconds
Views
16
Timestamp in Movie
00:29:05
Uploaded
Jul 13, 2025
Season
1
Episode
1
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 Been much higher, and then much lower, - Secrets of the Underground 00:06
Been much higher, and then much lower,
S01 • E03 Scree is a collection of broken rock fragments at the base of mountains or valleys - Secrets of the Underground 00:11
Scree is a collection of broken rock fragments at the base o...
S01 • E01 It works by injecting electrical current into the ground - Secrets of the Underground 00:12
It works by injecting electrical current into the ground
S01 • E02 That's been the challenge for the last 200 years, - Secrets of the Underground 00:06
That's been the challenge for the last 200 years,
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 • E07 Of this chamber Hovering in the sky above? - Secrets of the Underground 00:04
Of this chamber Hovering in the sky above?
S01 • E02 Several different native tribes - Secrets of the Underground 00:11
Several different native tribes
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 • 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