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That's because when the soil reaches a temperature
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Secrets of the Underground

That's because whenthe soil reaches a temperature above 600 degrees Celsius, the iron in...

That's because when
the soil reaches a temperature above 600 degrees Celsius, the iron in it
becomes permanently magnetised, leaving behind
a distinct fire fingerprint

Full Transcript

00:00:01.000 --> 00:00:03.048
That's because when the soil reaches a temperature
00:00:03.056 --> 00:00:05.084
above 600 degrees Celsius,
00:00:05.092 --> 00:00:09.002
the iron in it becomes permanently magnetised,
00:00:09.028 --> 00:00:11.092
leaving behind a distinct fire fingerprint.
Duration
12 seconds
Views
17
Timestamp in Movie
00:37:07
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 • E03 Well, sometimes, if they're really tall - Secrets of the Underground 00:05
Well, sometimes, if they're really tall
S01 • E07 The rti image seems to confirm Vance's interpretation. - Secrets of the Underground 00:06
The rti image seems to confirm Vance's interpretation.
S01 • E01 The dissected hill is made up of two distinct layers of soil. - Secrets of the Underground 00:04
The dissected hill is made up of two distinct layers of soil...
S01 • E08 If this site really was made by man, - Secrets of the Underground 00:06
If this site really was made by man,
S01 • E02 If it was used for some sort of sacred ritualistic thing, - Secrets of the Underground 00:08
If it was used for some sort of sacred ritualistic thing,
S01 • E07 What we can see, It looks like, basically, - Secrets of the Underground 00:11
What we can see, It looks like, basically,
S01 • E01 What we got is a 2.5' section of really dark dirt - Secrets of the Underground 00:15
What we got is a 2.5' section of really dark dirt
S01 • E03 And actually, what's kind of interesting - Secrets of the Underground 00:07
And actually, what's kind of interesting
S01 • E08 I know that several early cultures - Secrets of the Underground 00:07
I know that several early cultures
S01 • E02 There often is at these ceremonial sites. All right, let's run it. - Secrets of the Underground 00:04
There often is at these ceremonial sites. All right, let...
S01 • E03 Does this mean that the underwater crevices I found - Secrets of the Underground 00:06
Does this mean that the underwater crevices I found
S01 • E07 But before I embrace This theory wholeheartedly, - Secrets of the Underground 00:06
But before I embrace This theory wholeheartedly,
S01 • E08 In fact, there's a well-known stone formation in Wyoming - Secrets of the Underground 00:10
In fact, there's a well-known stone formation in Wyomin...
S01 • E02 (MAGNETOMETER BEEPING) - Secrets of the Underground 00:10
(MAGNETOMETER BEEPING)
S01 • E01 But I'm no geology expert - Secrets of the Underground 00:06
But I'm no geology expert
S01 • E03 Water could get through a boulder field just like this. - Secrets of the Underground 00:04
Water could get through a boulder field just like this.
S01 • E03 It would create cavities, it would create a passageway - Secrets of the Underground 00:06
It would create cavities, it would create a passageway
S01 • E08 It was an effective tool to predict when the summer solstice would occur, - Secrets of the Underground 00:08
It was an effective tool to predict when the summer solstice...
S01 • E01 I reach out to Dr Jennifer Burnham, a soil scientist. - Secrets of the Underground 00:04
I reach out to Dr Jennifer Burnham, a soil scientist.
S01 • E07 At the university Of connecticut, - Secrets of the Underground 00:07
At the university Of connecticut,