# This Sea Is the Most Mysterious in the World

Page: https://stenobird.com/podcast/bright-side-universe-7141660/this-sea-is-the-most-mysterious-in-the-world
Text version: https://stenobird.com/podcast/bright-side-universe-7141660/this-sea-is-the-most-mysterious-in-the-world.md
Podcast: [Bright Side Universe](https://stenobird.com/podcast/bright-side-universe-7141660)
Published: 2026-07-17T20:00:00+00:00
Episode link: https://traffic.megaphone.fm/ADME5431904668.mp3
Audio file: https://traffic.megaphone.fm/ADME5431904668.mp3
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JSON: https://stenobird.com/v1/public/podcasts/bright-side-universe-7141660/episodes/this-sea-is-the-most-mysterious-in-the-world
Duration seconds: 710

## Resource

The Black Sea is full of mysteries and interesting facts! Using remote-controlled vehicles, researchers found more than 40 ancient sunken ships in great condition underwater. There's a theory called "The Black Sea Deluge Hypothesis," which suggests the Black Sea was once a big freshwater lake that flooded quickly, in just 1-3 years. Beneath the sea, there’s a vast network of tunnels that might connect Romania and Turkey, with chisel marks showing they were man-made, but no one knows who made them. Plus, the Black Sea has two layers of water: a habitable freshwater layer on top and a deep, salty layer below where only bacteria and microorganisms live. Learn more about your ad choices. Visit megaphone.fm/adchoices

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## Transcript

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