I’ve always been fascinated by the ocean. It’s wild to think we know more about space than our own deep seas. I can’t help but imagine what mysteries might be hiding in those dark depths. I sometimes picture something strange popping up from under the water. Well, it turns out, there are plenty of unexplained things that people have found right in the middle of the ocean. From underwater cities to vanishing submarines, here are 20 most unexplained things found in the middle of the ocean!

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