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Doggerland is the name of a vast plain that joined Britain to Europe for nearly 12,000 years, until sea levels began rising dramatically after the last Ice Age. Taking its name from a prominent shipping hazard—Dogger Bank—this immense landbridge vanished beneath the North Sea around 6000 B.C. It was a busy thoroughfare for ancient hunters and gatherers. But archaeologists hardly gave it a thought until 2002, when British researchers saw seismic survey data from the petroleum industry.