The ocean is one of the remaining parts of planet Earth that we have yet to fully explore. Beneath its briny depths hide countless mysteries just waiting to be uncovered.

Swedish treasure hunters didn’t know what to expect when they embarked on a journey to scour the Baltic Sea in 2011. What they found using sonar technology, however, changed the way people would see the underwater world forever…

To this day, the ocean remains the least-explored environment on our planet. That was exactly why it was so alluring to two Swedish scientists and treasure hunters named Peter Lindberg and Dennis Asberg.

In 2011, the scientists acted on their passion when they journeyed to the bottom of the Baltic Sea as part of Ocean X Team. This diving organization had a singular mission: to conduct an exhaustive search for undiscovered species or objects and learn as much as possible from whatever they’d find.

Their mission was off to a slow start, but that was just par for the course; oceanic exploration requires patience, after all. As they’d soon find out, however, it wouldn’t last: one second they were fighting boredom, and the next, they were blown away…

During their mission, the scientists employed sonar technology to scan the floor of the ocean for potentially interesting finds. Using a thorough technique called side-scan sonar, it was only a matter of time before something strange caught their attention.

Roughly 300 feet below the surface of the Baltic Sea, the high-tech sonar technology picked up on a massive foreign object. Even while monitoring it on their computer screens, they weren’t able to properly identify what it was…

Peter and Dennis were obviously perplexed by the mysterious object—which, admittedly, seemed to resemble the Millennium Falcon, the spaceship piloted by protagonist Han Solo in Star Wars.

Millennium Falcon or not, one thing was certain: this object was so large and heavy that they wouldn’t just be able to retrieve it and bring it back to land. If they wanted to learn more about it, they would have to return with a diving team.

When they deployed more divers to explore the object, things only got more mysterious. Randomly, a bunch of the group’s electronic devices completely stopped working. And there was no scientific explanation for it, either.

“Anything electric out there, and the satellite phone as well, stopped working when we were above the object,” said diver Stefan Hogerborn, who was a part of the Ocean X Team helping to further study the anomaly.

Despite their electronic difficulties, the divers were still able to retrieve a sample of the object from their explorations. They were eager to bring it back to a laboratory so they could give it the proper analysis it required.

Once they returned to Sweden, they brought in the sample for analysis. Geologist Steve Weiner firmly established that whatever this object was, it was not something that occurred naturally. But what could it be?

The scientists were unable to find any evidence that would shed light on their strange find. Some speculated that it was the ancient remains of a battleship gun turret or that it could’ve even been a World War II anti-submarine device.

When word broke of their discovery, it was only a matter of time before it captured the interest of everyday people, who in turn, theorized its origins. The object was quickly nicknamed the “Baltic Sea anomaly.”

Soon, the conspiracy theory message boards swirled with interest. Some of the more outlandish theories claimed that a UFO had crashed in the water sometime during the Ice Age, landing at the bottom of the Baltic Sea.

For as popular as the theories were among excited theorists, they never really held much weight. In fact, there was no evidence to actually back any of their claims—though that didn’t stop rumors from continuing to spread.

With all the people who think the object could have extraterrestrial ties, it was only a matter of time before it was given another moniker. Eventually, it came to be known as “The Roswell of the Sea.”

In the meantime, Volker Bruchert, a professor who taught geology at Stockholm University, was asked to examine the sample. “My hypothesis is that this object, this structure, was formed during the Ice Age many thousands of years ago,” he speculated.

“Because the whole northern Baltic region is so heavily influenced by glacial thawing processes, both the feature and the rock samples are likely to have formed in connection with glacial and postglacial processes,” he continued.

Unfortunately, it looked like the true identify of this object would continue to be the source of speculation. While there was plenty of interest, Peter and Dennis hadn’t been able to drum up enough funding to help them conduct more research.

It’s strange to think that a lack of funds could potentially be holding humankind back from discovering the existence of extraterrestrial life on Earth. Hopefully the team can find funding so the truth can be revealed once and for all…