To some observers, it is a UFO - The 'Roswell of the Ocean', while others speculate that it is a Nazi anti-submarine defence, or a plug to the underworld.
But according to one expert, the 'strange' and 'mysterious' object, as described by the team who found it, is nothing more than glacial rocks that have been dragged across the ocean floor.
Volker BrŁchert, an associate professor of geology at Stockholm University, was handed stone samples of the object for analysis.
He said he believed he was seeing nothing more than normal rocks, and told Live Science: 'It's good to hear critical voices about this 'Baltic Sea mystery.
'What has been generously ignored by the Ocean-X team is that most of the samples they have brought up from the sea bottom are granites and gneisses and sandstones.'
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