The Guardian looks at efforts to map Doggerland, a prehistoric area of land in the North Sea between Britain and continental Europe that was submerged by rising sea levels at the end of the last ice age. “Using seabed mapping data the team plans to produce a 3D chart revealing the rivers, lakes, hills and coastlines of the country. Specialist survey ships will take core sediment samples from selected areas to extract millions of fragments of DNA from the buried plants and animals.”