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It's called electrical resistivity tomography, or ERT
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Secrets of the Underground

It's called electrical resistivitytomography, or ERT

It's called electrical resistivity
tomography, or ERT

Full Transcript

00:00:01.000 --> 00:00:05.004
It's called electrical resistivity tomography, or ERT.
Duration
5 seconds
Views
13
Timestamp in Movie
00:29:00
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 • E02 Yet, even he still has a lot to learn about the true purpose - Secrets of the Underground 00:06
Yet, even he still has a lot to learn about the true purpose
S01 • E07 So essentially what We're looking for is the sun. - Secrets of the Underground 00:04
So essentially what We're looking for is the sun.
S01 • E01 ERT is an advanced subsurface imaging technique - Secrets of the Underground 00:07
ERT is an advanced subsurface imaging technique
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 • 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 • 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 • 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...