Don't know how much of this is speculation but a great description here:
www.bbc.co.uk/news/magazine-12244964
Only 8000 years ago, which doesn't sound that long really. Extract:
"It is thought a landslide in Norway triggered one of the biggest tsunamis ever recorded on Earth, when a landlocked sea in the Norwegian trench burst its banks.
The water struck the north-east of Britain with such force it travelled 40km inland, turning low-lying plains into what is now the North Sea, and marshlands to the south into the Channel. Britain became an island nation."
Can you imagine what it must have been like watching that wave head towards you...
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