And here's an article about underwater archaeology in the popular press: https://www.theguardian.com/science/2017/apr/26/the-first-brexit-submerged-landscapes-

And here's an article about underwater archaeology in the popular press: https://www.theguardian.com/science/2017/apr/26/the-first-brexit-submerged-landscapes-of-the-north-sea-and-channel https://www.theguardian.com/science/2017/apr/26/the-first-br... ... which makes it clear that archaeologists are being pretty systematic about looking for settlements that were on the shore and are now drowned.