On a night in September 1931, the trawler Colinda was fishing the banks off the Norfolk coast when its nets snagged on a lump of peat lifted from the seabed. When the crew broke the block open, out fell a finely barbed harpoon point carved from antler, roughly 21 centimetres long. It was thousands of years old — and it had been dredged from beneath open sea. For decades trawlermen in the southern North Sea had been pulling up the teeth of mammoths, the bones of bison and deer, and worked flint tools, calling the debris "moorlog" and mostly throwing it back. The Colinda harpoon was harder to ignore: proof that the grey water between Britain and the Netherlands had once been dry land, and that people had lived and hunted there.
That land now has a name: Doggerland, after the Dogger Bank, the great sandbank that was once its high ground. During the last ice age, so much water was locked up in ice sheets that global sea levels stood roughly 120 metres lower than today. Britain was not an island but the north-western corner of a continuous European plain. Where the North Sea now lies stretched a low country of rivers, marshes, lagoons and gentle hills — a rich hunting and fishing ground for Mesolithic hunter-gatherers as the ice retreated.
A lost world mapped from the seabed
For most of the twentieth century Doggerland was a curiosity. That changed when geologists began repurposing the vast seismic surveys collected by the oil and gas industry. Using this data, researchers — notably a team at the University of Bradford — reconstructed the drowned landscape in startling detail: the winding course of a great river system, coastlines, salt marshes and hills, an area comparable in size to a sizeable European country. This was not a leftover land bridge but a heartland, quite possibly among the best places to live in Mesolithic Europe.
The term Doggerland itself is surprisingly recent: the archaeologist Bryony Coles coined it in the late 1990s, borrowing from the Dogger Bank to give the vanished land a name of its own. What emerged from the research was not an empty wilderness but somewhere that would have teemed with life. Red deer, wild horses, aurochs and elk moved across the plain; its rivers and estuaries would have been thick with fish and wildfowl. For hunter-gatherers, coasts and wetlands like these were prime real estate, offering food from both land and water. Whatever settlements once stood there have left almost nothing we can see, but the scatter of tools and bones hauled up in nets speaks of a populated country, not a barren crossing.
Then the water came for it. As the ice sheets melted, the sea rose steadily — not always gently, but in surges that could swallow camps and coastlines within a human lifetime. Over centuries the plain shrank to marshes, then islands, then shoals. The people who had lived there were pushed back onto the higher ground that would become Britain and the near Continent.
The wave that finished it
The most dramatic blow came from the north. Around 8,200 years ago, off the coast of Norway, a colossal section of the continental shelf gave way in an underwater landslide known as the Storegga Slide. It sent a tsunami racing across the North Atlantic and into the North Sea. In eastern Scotland, sediment left by the wave has been found well inland; along the Norwegian coast the surge may have run many metres above the tide line. For whatever remained of low-lying Doggerland, a wave of that scale would have been catastrophic, drowning the surviving land and any people still clinging to it.
The Storegga tsunami did not, by itself, sink Doggerland — the sea was already doing that — but it is often described as the event that finished off the last of it. Not long after, Britain was cut off for good, becoming the island it has been ever since. What had once been the centre of a world became a channel and then open sea.
Doggerland is now among the most active frontiers in archaeology. Wind-farm construction and dredging churn the same seabed that hides the evidence, and researchers race to sample sediments and recover artefacts before they are lost. Every so often a fishing boat still lifts a mammoth's tooth or a fragment of worked flint from the deep — a reminder that beneath the shipping lanes lies a country that once had rivers and firesides, and that the map of Europe is not fixed but merely paused.
Quiz nuggets
- Doggerland is the name for the now-submerged land beneath the North Sea that once joined Britain to continental Europe.
- It is named after the Dogger Bank, a large sandbank that was formerly its higher ground.
- During the last ice age global sea levels stood roughly 120 metres lower than today.
- The Storegga Slide, an underwater landslide off Norway about 8,200 years ago, triggered a tsunami that helped finish off Doggerland.
- The 1931 trawler Colinda dredged up an antler harpoon point from the seabed — early evidence that people had lived on the drowned plain.