How did rising sea levels separate Britain from France?

Britain was not always an island; for much of the Pleistocene Epoch, it was connected to continental Europe by a land bridge across what is now the English Channel and the southern North Sea.312

As the ice sheets from the last ice age retreated, global sea levels rose due to the influx of meltwater. Between approximately 9,000 and 6,000 years ago, this rising water gradually inundated the low-lying region known as Doggerland, which had previously linked Britain to Denmark and the Netherlands.3124

By about 8,000 years ago, the rising sea finally submerged the land bridge across the Strait of Dover, allowing the waters of the North Sea to merge with the English Channel. Some scientists also hypothesize that catastrophic tsunamis triggered by the Storegga slides may have contributed to the final destruction of these remaining land connections. This separation forced Britain to develop in relative isolation, significantly influencing its cultural and historical trajectory.3145