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(CNN) -- Deep down on the bottom of the Baltic Sea, Swedish treasure hunters think they have made the find of a lifetime.
The problem is, they're not exactly sure what it is they've uncovered.
"I have been doing this for nearly 20 years so I have a seen a few objects on the bottom, but nothing like this," said Lindberg.
Using side-scan sonar, the team found a 60-meter diameter cylinder-shaped object, with a rigid tail 400 meters long.
The imaging technique involves pulling a sonar "towfish" -- that essentially looks sideways underwater - behind a boat, where it creates sound echoes to map the sea floor below.
On another pass over the object, the sonar showed a second disc-like shape 200 meters away.