![What Is This Mysterious Sunken Object Beneath The Baltic Sea? | The Mystery Beneath | Timeline What Is This Mysterious Sunken Object Beneath The Baltic Sea? | The Mystery Beneath | Timeline](https://i.ytimg.com/vi/ImV8f0pOoXQ/maxresdefault.jpg)
Treasure hunters Peter and Dennis were out on a typical day exploring the Baltic Sea when a very unusual image appeared on the sonar. A nearly 200-foot cylindrical object was something that had never been seen before. This documentary takes you on an extraordinary journey to find out what the ...
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