![The Mystery Beneath](https://image.chilimovie.com/public/en/300px/20210130/6xZolx8iZd8lwCBnJ0b0nHg9wOk.jpg)
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A group of treasure hunters discover a mysterious object at the bottom of the Baltic Sea in this documentary. Theories abound about the large object's origins. It might be a UFO, manmade, or it might be a naturally occurring phenomenon. Nobody knows.