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I've always been fascinated by America's ancient earthen structures
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Secrets of the Underground

I've always been fascinated byAmerica's ancient earthen structures

I've always been fascinated by
America's ancient earthen structures

Full Transcript

00:00:01.000 --> 00:00:05.006
I've always been fascinated by America's ancient earthen structures.
Duration
6 seconds
Views
14
Timestamp in Movie
00:28:06
Uploaded
Jul 09, 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 In fact, looking at the drone footage, - Secrets of the Underground 00:07
In fact, looking at the drone footage,
S01 • E02 Like Effigy Mounds National Monument in Iowa, - Secrets of the Underground 00:10
Like Effigy Mounds National Monument in Iowa,
S01 • E07 With the late summer Corn harvest, - Secrets of the Underground 00:08
With the late summer Corn harvest,
S01 • E01 I'm wondering if the Mima Mounds might be an extreme version - Secrets of the Underground 00:07
I'm wondering if the Mima Mounds might be an extreme ve...
S01 • E08 But how could a site 40ft underwater be sacred ground? - Secrets of the Underground 00:04
But how could a site 40ft underwater be sacred ground?
S01 • E02 But their beauty and impressiveness is overshadowed - Secrets of the Underground 00:06
But their beauty and impressiveness is overshadowed
S01 • E01 Gilgai are mounds and depressions forming in clay-rich soil, - Secrets of the Underground 00:13
Gilgai are mounds and depressions forming in clay-rich soil,
S01 • E08 It's unlikely an ancient civilisation would have dropped six stones - Secrets of the Underground 00:08
It's unlikely an ancient civilisation would have droppe...
S01 • E07 But according to vance, - Secrets of the Underground 00:06
But according to vance,
S01 • E03 I mean, it looks like you got a boulder field over there. - Secrets of the Underground 00:04
I mean, it looks like you got a boulder field over there.
S01 • E02 If humans were buried under these bear-shaped mounds in Iowa... - Secrets of the Underground 00:05
If humans were buried under these bear-shaped mounds in Iowa...
S01 • E08 But could it be possible that in the time of Hank's ancient ancestors, - Secrets of the Underground 00:08
But could it be possible that in the time of Hank's anc...
S01 • E02 Couldn't there also be remains beneath Ohio's Serpent Mound? - Secrets of the Underground 00:05
Couldn't there also be remains beneath Ohio's Serp...
S01 • E01 Over time, the subsoil is forced upwards - Secrets of the Underground 00:06
Over time, the subsoil is forced upwards
S01 • E07 The shortest day of the year, - Secrets of the Underground 00:05
The shortest day of the year,
S01 • E03 In fact, it reminds me of something I saw before I met up with Tim and Paki. - Secrets of the Underground 00:06
In fact, it reminds me of something I saw before I met up wi...
S01 • E02 It's a protected site, - Secrets of the Underground 00:06
It's a protected site,
S01 • E08 If so, the possibility that this site is man-made is more likely. - Secrets of the Underground 00:05
If so, the possibility that this site is man-made is more li...
S01 • E01 The only way to know if this is what I'm seeing at Mima Mounds - Secrets of the Underground 00:08
The only way to know if this is what I'm seeing at Mima...
S01 • E02 Luckily, I've got the latest technology - Secrets of the Underground 00:05
Luckily, I've got the latest technology