Overview

A sonar image captured in 2011 showing a strange, disc-shaped object on the seafloor of the Baltic Sea.

Key Insights

The Baltic Sea Anomaly is a fascinating subject within unsolved mysteries. A sonar image captured in 2011 showing a strange, disc-shaped object on the seafloor of the Baltic Sea. The object is roughly 60 meters wide. Its surface appears unusually smooth in some scans. Divers reported equipment interference near the site. Marine diver.