The Baltic Sea Anomaly refers to interpretations of an indistinct sonar image taken in June 2011 by Peter Lindberg, Dennis Åsberg and their Swedish treasure hunter group named “Ocean X.” It was discovered on the floor of the Northern Baltic Sea at the centre of the Bothnian Sea. For its strange appearance, the Baltic Sea Anomaly has caused debates on what it could be.
The “Ocean X” team has claimed their image shows a 60-metre diameter circular object with features resembling ramps, stairways, drag marks and other structures, basically indicates it was not naturally created.
Some experts, especially the ufologists community have claimed that the Baltic Sea Anomaly is actually the wreck of an alien ship that was somehow sunk in ancient times. Whereas the mainstream researchers consider it to be nothing more than a natural rock formation.
The group of the divers who discovered the anomaly deep into the ocean gave samples of stone from the object to Volker Brüchert, an associate professor of geology at Stockholm University. Swedish tabloids quote Brüchert as saying: “I was surprised when I researched the material I found a great black stone that could be a volcanic rock. My hypothesis is that this object, this structure was formed during the Ice Age many thousands of years ago.”
In other words, an expert appears to back up their claims that this seafloor object is unexplained, and perhaps is an Atlantis-like ancient building complex.
On the other hand, a number of imaginative illustrations resembling underwater photos or high-resolution scans have been circulating through various news-media sources, along with claims that “the object could be a UFO, or a portal into another world, or an underwater Stonehenge.” To this day, there is no conclusive explanation to the existence of the strange Baltic Sea Anomaly.
Apart from the Baltic Sea Anomaly, there have been discovered a lot of complicated ancient underwater structures that are widely believed to be ruins of man-made artificial things or the evidence of lost civilizations. The Yonaguni Submarine Ruins situated in Japan is significantly one of them, another one is the Underwater Structure of Cuba.