 Doggerland eventually became submerged, cutting off what was previously the British peninsula from the European mainland by around 6500 BC.The Dogger Bank, an upland area of Doggerland, remained an island until at least 5000 BC.Key stages are now believed to have included the gradual evolution of a large tidal bay between eastern England and Dogger Bank by 9000 BC and a rapid sea level rise thereafter, leading to Dogger Bank becoming an island and Britain becoming physically disconnected from the continent.