During deglaciation since the Last Glacial Maximum, between about 20,000 to 7,000 years ago (20–7 ka), the sea level rose by a total of about 100 m, at times at

During deglaciation since the Last Glacial Maximum, between about 20,000 to 7,000 years ago (20–7 ka), the sea level rose by a total of about 100 m, at times at extremely high rates, due to the rapid melting of the British-Irish Sea, Fennoscandian, Laurentide, Barents-Kara, Patagonian, Innuitian and parts of the Antarctic ice sheets. [https://en.wikipedia.org/wiki/Early_Holocene_sea_level_rise https://en.wikipedia.org/wiki/Early_Holocene_sea_level_rise] Setting the sea surface to -100m on https://www.floodmap.net/ https://www.floodmap.net/ shows a very different world: walking dry-shod from Ireland to Helsinki.