Unexplained 60 meter object resting at the bottom of the Baltic Sea near Sweden

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Sonar readings show that the mysterious object is about 60 meters across, or, about the size of a jumbo jet. And it's not alone. Nearby on the sea floor is another, smaller object with a similar shape. Even more fascinating, both objects have "drag marks" behind them on the sea floor, stretching back more than 400 feet.

"It's definitely something, at least," says Andreas Olsson, head of archaeology, Swedish Maritime Museums.

Divers find large, unexplained object at bottom of Baltic Sea