Speculation has surrounded the 200ft wide object with its “staircase leading to a dark hole” since it was first discovered by oceanographers in 2012.
The Baltic Sea Anomaly bears a striking resemblance to the Star Wars Millennium Falcon and its steel grey appearance has prompted claims it could be a crashed UFO.
A UFO expert says the strange object, which was found 300ft below the Baltic, could just be the tip of the iceberg.
My own opinions upon looking at the sonar scans of the surrounding area, is that I feel there is visual evidence of more unusual anomalies
Ryan Castledine believes the area surrounding the Anomaly, which appears to be formed of pieces of angular metal, could contain even more unidentified objects.
Mr Castledine told Express.co.uk: “My own opinions upon looking at the sonar scans of the surrounding area, is that I feel there is visual evidence of more unusual anomalies, with unnatural shapes, accompanied by scours in the sea bed, which I feel demand further analysis.”
The Baltic Sea Anomaly could lead to the discovery of crashed UFOs, says one researcher
The Baltic Sea Anomaly bears a resemblance to the Star Ward Millenium Falcon
The 26ft tall object was discovered by Swedish explorer Peter Lindberg and his Ocean X team of marine explorers during a dive searching for a shipwreck.
Baffled oceanographers say despite the structure looking like a rock, it appears to be made of metal.
The mystery deepens following claims electric and satellite diving equipment cuts out when near the Anomaly.
Mr Castledaine said: “Reports have been made by the Ocean X team of problems with electric equipment when within a 200-metre radius the object, as if it is emitting a field that interferes with equipment.
Shutterstock / Leo Blanchette
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“When they made a dive on the anomaly with cameras the hard drives malfunctioned. They subsequently rescued a few images which do appear to show it is indeed a heavily rusted metallic object.
“The team’s biggest sceptic, Peter Lindberg, has officially been converted. In a telephone interview he has mentioned that now he believes the anomaly to be a very special object, and the whole pursuit for the truth surrounding it, is becoming a very special experience for him and his team.”
Mr Castledine, who runs the Mystery History channel on YouTube, said further investigation is needed.
The Baltic Sea Anomaly was discovered in 2012
He said: “Initial interest in the anomaly was sparked by its unnatural shape, numerous right angles, a dome structure on its top, and what appears to be stairs running down one side.
“It’s on a raised surface of about six metres in height, as if it came to rest after carving into the Earth, a substantial area of what appears to be a scraped-out seabed is immediately to one side, which gives it the uncanny appearance of a crash-landed craft.
“A sample recovered by divers was reportedly found to contain limonite and goethite. Israeli geologist Steve Weiner claimed that these materials are metals which nature could not reproduce itself.
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“However, Swedish geologists Fredrik Klingberg and Martin Jakobsson disagree, saying that the chemical composition of the sample resembles that of nodules, which can indeed be formed naturally. More precise sampling is needed.”
The UFO researcher said Ocean X is now looking for investment to continues its investigation.
Geology professor Volker Brucherz said the structure could have formed in the Ice Age and could be at least 140,000 years old.