The Little Mermaid’s Kingdom Was Found on a Sonar Scan — And It Shouldn’t Exist

In 2009, marine geologists scanning the Baltic Sea for WWII wrecks caught a sonar reading that mapped an entire circular city — domes, towers, and something resembling coral spires. It appeared 300 feet deep, glowing faintly, then vanished from radar.

The recording technician, Lena Ström, reported hearing a “melody” through her headset — high-pitched and rhythmic. When she played it back later, it was gone.

Days later, Lena disappeared while diving in the same area. Her last radio transmission was chillingly simple:

“I see her. She’s not swimming — she’s waiting.”