"Stone Age world beneath the Baltic Sea"... I don't see why this is news. As near as I can tell the countries near and around the Baltic Sea are to this day still in the Stone Age...
Until 1989, sonar scans, diving, underwater excavation, and aerial surveying were forbidden in East Germany for fear scientists would run (or swim) away.
Why Communism sucks part 1.
Coastal development, which might have disturbed sites near shore, was nearly nonexistent.
Why Communism sucks part 2.