Mystery AtlasOcean Mysteries
Underwater Discoveries
Submerged structures and contested finds — Yonaguni, the Baltic Sea anomaly, sunken port cities — what divers found and what geology and archaeology conclude.
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What Is the Baltic Sea Anomaly?
What the Baltic Sea anomaly is: the 2011 sonar discovery, the artificial-structure claim its own finders promoted, and what geologists actually found.
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What Is the Yonaguni Monument?
What the Yonaguni Monument is: Japan's submerged rock formation, the man-made monument theory, and why most geologists say it's entirely natural.
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