How was Britain connected to continental Europe before the Strait of Dover filled with water?

Before the Strait of Dover was submerged by rising sea levels, Britain was physically connected to continental Europe by a land bridge. This region, often referred to as Doggerland, spanned the area that would eventually become the southern part of the North Sea.123

During the late Pleistocene Epoch, lower sea levels—caused by water being locked in glaciers—exposed this land, allowing Britain to serve as an extension of the European continent. This bridge was inhabited by humans who gradually abandoned the area as sea levels rose between 9,000 and 7,000 years ago. The final submergence of the land bridge across the Strait of Dover occurred approximately 8,000 years ago, though some scientists suggest that catastrophic tsunamis triggered by submarine landslides may have also played a role in washing away the remaining connections.123