A team of Swedish sea treasure hunters has found something extraordinary on a sea bed between Finland and Sweden, prompting speculation that the wreckage is that of a crashed flying saucer.

The team, led by Swedish researcher Peter Lindberg, discovered a large, round-shaped object on the 300-foot-deep ocean floor.

Lindberg's team, an experienced group of Swedish salvagers who have had success in the past recovering sunken ships and cargo, made the discovery inadvertently while hunting for a century-old shipwreck that was purported to hold several cases of rare champagne.

The team was using sonar to survey the Gulf of Bothnia last month while looking for the shipwreck. Lindberg discovered a mysterious round object, a large circle about 60 feet in diameter, while studying the sonar scans.

"You see a lot of weird stuff in this job, but during my 18 years as a professional I have never seen anything like this. The shape is completely round," Lindberg told local media.

There was evidence of scars and marks disturbing the earth nearby, suggesting that the object moved across the ocean floor to where the team found it, added Lindberg.

While the object seems unusual, its discovery has sparked a lot of different viewpoints. Various reputable news sources have been sparking lively debate on what the mysterious sunken object could, or couldn't, possibly be.

The placement of the object was even more curious, as the video shows there appears to be a long trail of displaced seabed that suggests that the object may have had a rough landing.

UFO enthusiasts believe it could be an extraterrestrial spacecraft that crashed, thereby dislocating the earth around it. Some have even suggested it resembles the Millennium Falcon from the "Star Wars" series, with its distinctive front forks and round shape.

However, it could be a natural feature formation like the rim of a small underground volcano, or even a sunken round man-made object. Lindberg himself suggested that it could be a "new Stonehenge."

While there is another view point that the object is neither an extraterrestrial craft nor a natural feature but instead a rotating gun turret from a World War II era battleship. It's possible that an explosion on the ship’s deck could have blown it out of the deck ring where it was anchored and it slid into the ocean’s depths, more or less intact, reports Discovery News.

Moreover Lindberg's claims that the object is "completely round" may or may not be accurate as the sonar images were not very clear to verify this, reports Fox News. Besides the scars leading to (or from the feature) may suggest some kind of movement, it is also possible that they have nothing to do with the object, added the report.

This is not the first time an unidentified sunken object has led to conjecture. There is the famous underwater mystery of "Bimini Road," a rock formation in the Caribbean that resembles a road. Even though geologists have said that the rocks are naturally formed, there are theorists who link the formation to an unknown civilization or to the lost city of Atlantis.

So until someone checks into the object any further, there is no clear explanation for it. However, Lindberg said that since the object could turn out to be completely worthless, they could not afford to spend funds on examining it further.