Except when the sea levels change. https://en.wikipedia.org/wiki/Lyonesse https://en.wikipedia.org/wiki/Lyonesse > A notable aspect of Scilly's historic envir

Except when the sea levels change. https://en.wikipedia.org/wiki/Lyonesse https://en.wikipedia.org/wiki/Lyonesse > A notable aspect of Scilly's historic environment is the presence of stone walls and other remains below high water, the result of low-lying land being submerged by the gradual rise in sea-level. The timing and nature of changing land areas and the separation of the individual islands has, in the past, been the subject of much conjecture and debate. https://archaeologydataservice.ac.uk/archives/view/lyonesse_eh_2014/overview.cfm https://archaeologydataservice.ac.uk/archives/view/lyonesse_... Likewise, Dogger Bank is a fishing area that used to be a land bridge connecting the now-island Britain to mainland Europe. https://www.theguardian.com/science/2021/aug/01/doggerland-lost-atlantis-of-the-north-sea-gives-up-its-ancient-secrets https://www.theguardian.com/science/2021/aug/01/doggerland-l... https://thenaturalhistorian.com/2014/02/04/fishing-for-fossils-in-the-north-sea-the-lost-world-of-doggerland/ https://thenaturalhistorian.com/2014/02/04/fishing-for-fossi... Some times, all it takes is a storm to sink your land: https://en.wikipedia.org/wiki/Saint_Marcellus%27s_flood https://en.wikipedia.org/wiki/Saint_Marcellus%27s_flood