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When I started researching this story
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Secrets of the Underground

When I startedresearching this story, I knew the size of the Great Lakeshad fluctuated...

When I started
researching this story, I knew the size of the Great Lakes
had fluctuated over time, just not how much
they'd changed or when

Full Transcript

00:00:01.000 --> 00:00:03.008
When I started researching this story,
00:00:03.016 --> 00:00:06.048
I knew the size of the Great Lakes had fluctuated over time,
00:00:06.056 --> 00:00:09.024
just not how much they'd changed or when.
Duration
9 seconds
Views
19
Timestamp in Movie
00:28:43
Uploaded
Jul 13, 2025
Season
1
Episode
8
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 • E03 I'm walking around the shoreline right at the moment, - Secrets of the Underground 00:08
I'm walking around the shoreline right at the moment,
S01 • E02 I'm teaming up with archaeologist Dr Jarrod Burks, - Secrets of the Underground 00:07
I'm teaming up with archaeologist Dr Jarrod Burks,
S01 • E07 Totally by chance, - Secrets of the Underground 00:06
Totally by chance,
S01 • E01 If I can find clay in the soil, that could suggest these are gilgai. - Secrets of the Underground 00:06
If I can find clay in the soil, that could suggest these are...
S01 • E03 As I scouted the shoreline, - Secrets of the Underground 00:10
As I scouted the shoreline,
S01 • E01 So I'm turning to geophysicist Dr Mike Feves - Secrets of the Underground 00:09
So I'm turning to geophysicist Dr Mike Feves
S01 • E02 For the better part of the last decade, - Secrets of the Underground 00:07
For the better part of the last decade,
S01 • E08 So I met up with local expert Brian Price to find out more. - Secrets of the Underground 00:04
So I met up with local expert Brian Price to find out more.
S01 • E07 Using an app on my phone That tracks solar movements, - Secrets of the Underground 00:06
Using an app on my phone That tracks solar movements,
S01 • E08 Brian has been studying this part of the country for decades, - Secrets of the Underground 00:10
Brian has been studying this part of the country for decades...
S01 • E02 And he's been able to uncover clues beneath its surface - Secrets of the Underground 00:06
And he's been able to uncover clues beneath its surface
S01 • E03 If you look at this rock, - Secrets of the Underground 00:09
If you look at this rock,
S01 • E01 It's called electrical resistivity tomography, or ERT. - Secrets of the Underground 00:05
It's called electrical resistivity tomography, or ERT.
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,