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Today, it's only about 30% as deep as it was when it was full
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Secrets of the Underground

Today, it's only about 30% as deepas it was when it was full

Today, it's only about 30% as deep
as it was when it was full

Full Transcript

00:00:01.000 --> 00:00:05.072
Today, it's only about 30% as deep as it was when it was full.
Duration
6 seconds
Views
11
Timestamp in Movie
00:21:57
Uploaded
Jul 13, 2025
Season
1
Episode
3
Genres

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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...