
Here is more information about this object from wikipedia:
The Baltic Sea anomaly is a 60-metre (200 ft) diameter circular rock-like formation on the floor of the Baltic Sea, discovered by Peter Lindberg, Dennis Åsberg and their Swedish “Ocean X” diving team in June 2011. The team reported that the formation rests on a pillar and includes a structure similar in appearance to a staircase, leading to a dark hole.
Commentators have suggested that the structure could be a World War II anti-submarine device, a battleship gun turret, sediment dropped by a fishing trawler, or a flying saucer. Geologists have stated that it is most likely a natural geological formation.
The discovery was made on June 19, 2011 by the Swedish based “Ocean X Team” during a dive in the Baltic Sea between Sweden and Finland while searching for an old shipwreck. The group describes themselves as treasure hunters and salvage operators who specialize in underwater searches for sunken “antique high-end alcoholic beverages and historic artefacts”.[1] In March 2012, Ocean X formalized a partnership with entertainment producers Titan TV to produce a TV documentary series and documentary film.[2]
Seriously what do you think this is? Feel free to comment.

It is a pile of rocks. There are photos of it. The rocks were most likely dropped by a retreating glacier during the last Ice Age.
Hans Solo is in there
Why is there no sediment on it?
I think it’s a millennium falcon replica from ancient times.
Ots an alien spaceship that was parked just before the great flood ghat wiped away most of humanity, the occupants were out looking at stuff when the flood hit and they were killed and the ship was left to grow speculation of its purpose