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The grave may be too deep for GPR to accurately detect it
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Secrets of the Underground

The grave may be too deepfor GPR to accurately detect it, so we're turning to...

The grave may be too deep
for GPR to accurately detect it, so we're turning to electrical
resistivity tomography, or ERT, which can penetrate
to greater depths

Full Transcript

00:00:01.000 --> 00:00:05.024
The grave may be too deep for GPR to accurately detect it,
00:00:05.032 --> 00:00:09.006
so we're turning to electrical resistivity tomography, or ERT,
00:00:09.068 --> 00:00:11.006
which can penetrate to greater depths.
Duration
12 seconds
Views
21
Timestamp in Movie
00:10:03
Uploaded
Jul 13, 2025
Season
1
Episode
3
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 I'm looking into a series of tunnels - Secrets of the Underground 00:10
I'm looking into a series of tunnels
S01 • E01 Could there be a secret staircase from the poker room to the basement? - Secrets of the Underground 00:05
Could there be a secret staircase from the poker room to the...
S01 • E07 That took place in 2006. - Secrets of the Underground 00:04
That took place in 2006.
S01 • E08 (GPR BEEPING) - Secrets of the Underground 00:05
(GPR BEEPING)
S01 • E07 In the wake of a blizzard That year, - Secrets of the Underground 00:07
In the wake of a blizzard That year,
S01 • E01 To trace the escape route of Al Capone, - Secrets of the Underground 00:05
To trace the escape route of Al Capone,
S01 • E02 Like a New World Order of powerful elites, - Secrets of the Underground 00:09
Like a New World Order of powerful elites,
S01 • E07 But it turns out, This wasn't just any old crater. - Secrets of the Underground 00:04
But it turns out, This wasn't just any old crater.
S01 • E03 Tim and his assistant Marian set up their ERT gear - Secrets of the Underground 00:09
Tim and his assistant Marian set up their ERT gear
S01 • E08 This is the outside wall of the notorious Spanish Dungeon, - Secrets of the Underground 00:10
This is the outside wall of the notorious Spanish Dungeon,
S01 • E01 And later, I'll deploy another set of gadgets - Secrets of the Underground 00:06
And later, I'll deploy another set of gadgets
S01 • E07 That emit an array Of toxic vapors, - Secrets of the Underground 00:06
That emit an array Of toxic vapors,
S01 • E02 I'll go ahead and eliminate that last one immediately, - Secrets of the Underground 00:09
I'll go ahead and eliminate that last one immediately,
S01 • E03 Tim thinks it could mark the spot - Secrets of the Underground 00:05
Tim thinks it could mark the spot
S01 • E08 For decades, rumours persisted among inmates - Secrets of the Underground 00:07
For decades, rumours persisted among inmates
S01 • E01 Are they the work of ancient humans, the earth itself, - Secrets of the Underground 00:08
Are they the work of ancient humans, the earth itself,
S01 • E02 I'm anxious to apply some state-of-the-art technology - Secrets of the Underground 00:06
I'm anxious to apply some state-of-the-art technology
S01 • E07 Are often undetectable To humans, - Secrets of the Underground 00:07
Are often undetectable To humans,
S01 • E08 And I may have just found new evidence to prove it. - Secrets of the Underground 00:05
And I may have just found new evidence to prove it.
S01 • E08 It looks like a crawlspace, like, right in this region right here. - Secrets of the Underground 00:04
It looks like a crawlspace, like, right in this region right...