Between roughly 10,000 and 6,000 years ago, a stretch of land connected Britain to mainland Europe across what is now the North Sea. Archaeologists and geologists call it Doggerland, and this film traces how it disappeared, from the retreat of the ice sheets that first exposed it as habitable ground to the rising seas and catastrophic events, including a tsunami triggered by the Storegga Slide off Norway, that finally put it underwater. Fishing trawlers have dredged up mammoth bones, flint tools, and antler harpoons from the seabed for decades, and the film uses those finds alongside seismic survey data to reconstruct what the landscape once looked like: rivers, marshes, and hunting grounds where fishermen now cast nets. The pace is measured and fact-driven, moving from the mechanics of glacial melt to the human communities who lived on and eventually lost this land. It closes with the sobering point that an entire inhabited region can vanish from a map within a few thousand years.