UFO found in the Baltic Sea?

A group called Ocean explorers have found a huge,round circle, at 87 meters depth in the Baltic Sea.between Sweden and Finland. The object is about 60 meters in diam.
Groupleader Peter Lindberg says the absolute round shape makes it a very unique.

Beside the round object,is a 300 meters long,"glidetrack",like the object has slid across the oceanfloor,before settling.

Andréas Olsson, marinearcheologist at the Marine Museum,shown the pictures,says it is too early to guess what the object may be. But that he believes it to be most likely it is a natural seafloor formation.