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First, I need to talk to the man who made the initial discovery
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Secrets of the Underground

First, I need to talk to the manwho made the initial discovery, underwater archaeologistDr...

First, I need to talk to the man
who made the initial discovery, underwater archaeologist
Dr Mark Holley

Full Transcript

00:00:01.000 --> 00:00:04.044
First, I need to talk to the man who made the initial discovery,
00:00:04.052 --> 00:00:07.032
underwater archaeologist Dr Mark Holley.
Duration
7 seconds
Views
19
Timestamp in Movie
00:24:21
Uploaded
Jul 09, 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 • E02 And now I'm investigating an underground link between - Secrets of the Underground 00:07
And now I'm investigating an underground link between
S01 • E01 This mysterious landscape is so bizarre, - Secrets of the Underground 00:07
This mysterious landscape is so bizarre,
S01 • E07 You can look right down Into a cavity right down there. - Secrets of the Underground 00:05
You can look right down Into a cavity right down there.
S01 • E03 I'd searched for other lakes that might offer a clue - Secrets of the Underground 00:07
I'd searched for other lakes that might offer a clue
S01 • E08 If you don't go through Mark Holley, you don't see the site. - Secrets of the Underground 00:04
If you don't go through Mark Holley, you don't see...
S01 • E02 But I'm still not sure what it adds up to, - Secrets of the Underground 00:05
But I'm still not sure what it adds up to,
S01 • E07 Here, let's go down Right through here, - Secrets of the Underground 00:05
Here, let's go down Right through here,
S01 • E01 That might be a stretch, - Secrets of the Underground 00:06
That might be a stretch,
S01 • E03 Last winter, it was one-and-a-half times bigger than Mountain Lake, - Secrets of the Underground 00:09
Last winter, it was one-and-a-half times bigger than Mountai...
S01 • E08 Having granted me special access, - Secrets of the Underground 00:10
Having granted me special access,
S01 • E02 Then a friend texts me - Secrets of the Underground 00:11
Then a friend texts me
S01 • E01 When early explorers happened upon this spot in 1841, - Secrets of the Underground 00:14
When early explorers happened upon this spot in 1841,
S01 • E03 The reason? Multiple openings in the lake bed - Secrets of the Underground 00:07
The reason? Multiple openings in the lake bed
S01 • E07 My gosh. This is a structure. - Secrets of the Underground 00:05
My gosh. This is a structure.
S01 • E02 Namely, why is there a sealed-off tunnel - Secrets of the Underground 00:06
Namely, why is there a sealed-off tunnel
S01 • E08 The site that we're looking at is possibly a ceremonial site. - Secrets of the Underground 00:06
The site that we're looking at is possibly a ceremonial...
S01 • E03 But there are fundamental differences between Lost Lake and Mountain Lake. - Secrets of the Underground 00:05
But there are fundamental differences between Lost Lake and ...
S01 • E07 That's what we saw right there. That was the window. - Secrets of the Underground 00:05
That's what we saw right there. That was the window.
S01 • E02 As it turns out, - Secrets of the Underground 00:08
As it turns out,
S01 • E03 Lost Lake goes through the same cycle every year. - Secrets of the Underground 00:04
Lost Lake goes through the same cycle every year.