A mysterious cylindrical object is sitting 300 feet at the bottom of the Baltic Sea between Sweden and Finland, and nobody knows what it is -- yet.
Deep sea divers using remote-controlled cameras are heading to the site on Friday. They'll try to determine the exact identity of the object, which side-scan sonar first revealed in June 2011.
"Side-scan sonar is not a photograph and it can create false echoes, so it's not crystal clear what exactly it is that you're recording," Radford said. "The object that we're talking about is basically flush with the ocean floor, and side-scan sonar is much less reliable for things like that."
In what's been compared to an episode of "The X-Files," Peter Lindberg, captain of the Ocean Explorer, and his co-researcher Dennis Asberg made global headlines last year when they presented sonar images of a nearly 200-foot-wide circular anomaly -- looking very much like the fictitious Millennium Falcon spacecraft from the "Star Wars" movies.
"We don't know whether it is a natural phenomenon or an object," Lindberg told Fox News.
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