"Doggerland was an area of land, now submerged beneath the southern North Sea, that connected Great Britain to continental Europe. It was flooded by rising sea levels around 6,500–6,200 BC. Geological surveys have suggested that it stretched from Britain's east coast to the Netherlands and the western coasts of Germany and the peninsula of Jutland. It was probably a rich habitat with human habitation in the Mesolithic period, although rising sea levels gradually reduced it to low-lying islands before its final submergence, possibly following a tsunami caused by the Storegga Slide." (Wikipedia)
According to the National Geographic, "Evidence of Doggerlanders’ nomadic presence can be found embedded in the seafloor, where modern fishermen often find ancient bones and tools that date to about 9,000 years ago. These artifacts brought Doggerland’s submerged history to the attention of British and Dutch archaeologists and paleontologists.
"Using sophisticated seismic survey data acquired mainly by oil companies drilling in the North Sea, the scientists have been able to reconstruct a digital model of nearly 46,620 square kilometers (18,000 square miles) of what Doggerland looked like before it was flooded."
"The prehistoric existence of what is now known as Doggerland was established in the late 19th century. H. G. Wells referred to the concept in his short story A Story of the Stone Age of 1897, set in 'a time when one might have walked dryshod from France (as we call it now) to England, and when a broad and sluggish Thames flowed through its marshes to meet its father Rhine, flowing through a wide and level country that is under water in these latter days, and which we know by the name of the North Sea...Fifty thousand years ago it was, fifty thousand years if the reckoning of geologists is correct', though most of the action seems to occur in what is now Surrey and Kent, but stretching out to Doggerland." (Wikipedia)
Ancient Origins reported in 2015 that "[t]he study of Doggerland has received a €2.5 million ($2.8 million) Advanced Research Grant from the European Research Council, with hopes that the results of the study provide better insight into the life of prehistoric inhabitants who are thought to have resided in the area for about 6000 years."
According to Science Magazine (2020), "The dark, cold waters that now hide the region add to its allure because they preserve organic material for DNA analysis and radiocarbon dating better than on land. And the techniques now being tested to explore the area could aid research on submerged landscapes elsewhere, such as Beringia, the vanished land between Asia and North America inhabited by the first Americans. 'It really is a pioneer field and will make a huge difference to our understanding of prehistory,' retired University of York archaeologist Geoff Bailey says."
Note: According to new research announced in Dec. 2020, some parts of Doggerland may have survived the tsunami, forming islands which could have been populated by Stone Age people for some time.
Related: "Britain's Atlantis" Found At Bottom Of North Sea (2012).
British Atlantis: Archaeologists Begin Exploring Lost World Of Doggerland (2015).
10,000-Year-Old Prehistoric Forest Discovered Submerged Off UK Coast