The Fall of Númenor

Unlike the legendary kingdoms of Númenor or Atlantis, this was a slow and quiet fall:

Doggerland, a huge area of dry land that stretched from Scotland to Denmark was slowly submerged by water between 18,000 BC and 5,500 BC. Divers from oil companies have found remains of a 'drowned world' with a population of tens of thousands - which might once have been the 'real heartland' of Europe.