The Baltic sea is relatively new in the grand scheme of things. It was formed the receding Glaciers around 10,000 - 15,000 years ago.
This would not be the first settlement found under the water in this region. I was reading that there have been stoneage settlements found closer to the Swedish coasts which would have been last inhabited around 11,000 years ago.
I used to suspect this theory, but I always found the drag marks in the sand to be out of place and hard to explain.
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They may only appear to be drag marks, they may be evidence of slippage (like a landslide) or glacial ice pushing the massive stone bed which is detached from the bedrock over many years. EDIT: + AND many thousands of years ago.
As you say though, it's way out in the deep.