The rivers became estuaries.

The lakes became inlets.

The forests were inundated.

What had been a productive and inhabited landscape became, over several thousand years, the floor of the North Sea.

This inundation happened over a long enough period that people could adapt — could move to higher ground as their familiar landscape disappeared underwater.

But there was also at least one more catastrophic event: a submarine landslide on the Norwegian continental shelf, approximately 8,200 years ago, triggered a tsunami that struck the North Sea coast of Doggerland.

This event, known as the Storegga Slide, may have inundated large areas of low-lying Doggerland rapidly and catastrophically.