Baltic Sea Anomaly

The Baltic Sea Anomaly is basically a giant rock fragment located between Finland and Sweden. It is about nine to thirteen feet thick, two hundred feet in diameter; it also stands on a twenty-six foot pillar like object. The Baltic Sea anomaly is about two hundred eighty to two hundred ninety-five feet in depth. Geologists aren't sure what it is exactly, but they believe it may have been an old World War two submarine, a battleship gun turret, or sediment dropped by a fishing trawler.
Other people aren't so sure that it's any of those; many people think it might be a UFO or you can be like my father and think that it looks like Hans Solo's spaceship the Millennium Falcon from Star Wars, but if it was a UFO how could it have been made from granite like substance? In my opinion I don't think that it's just a rock at the bottom of the Baltic Sea. I'm not sure what it is, but rocks don't form like that naturally, and the universe is a huge place so it being a UFO is a logical answer. Besides scientists have found proof that some of the fragments on it date back to 14,000 years ago, so how could it be something from World War two, a gun turret, or a fishing trawler if its truly that old?