Beneath the Antarctic ice, which at first glance appears as a monotonous white plain, lies not a flat floor but a varied landscape: mountain ranges, valleys, canyons. Scientists long did not know its exact scale. But in January 2026, researchers presented a detailed map of the subglacial relief that overturns the notion of Antarctica's hidden world order. The map revealed tens of thousands of previously unknown hills.
The study's authors, led by Helen Ockenden of the University of Edinburgh, employed an unexpected method. Instead of traditional radar surveys (which left huge blank spots—sometimes up to one hundred and fifty kilometers between lines), the scientists used high-resolution satellite observations combined with the physics of ice motion.
The method, called ice-flow perturbation analysis, allows one to 'see' the subglacial relief indirectly: as ice flows over irregularities in the bed, it creates waves on the surface, and satellites detect these micro-waves with extreme precision. In this way, the researchers reconstructed the shape of the bedrock even in areas where direct measurements were previously impossible.
The result is the first continental-scale map of the subglacial landscape. It covers all of Antarctica and reveals more than thirty thousand hills ranging from fifty meters in height. The map shows not just hills: the researchers discerned rocky alpine valleys, deep glacial canyons, vast plateaus, high ridges, and scars from glacial erosion. The relief turned out to be as diverse as on other continents—as if the entire history of the Earth's surface had been preserved under the ice and survived through the ages.
Why does this matter? The shape of the bed directly determines how ice moves toward the ocean. Prominent hills and mountain peaks act as anchors: they create friction that slows the glacier's discharge into the sea. This knowledge is critical for predicting ice melt and global sea-level rise. As Robert Bingham, professor of glaciology and geophysics at the University of Edinburgh, explains: 'An accurate map of the bed is necessary to properly account for friction in numerical models.'
Without it, predictions of ice flow speed and its contribution to global sea-level rise remain incomplete.' Today these predictions are not abstract: they influence government decisions on protecting coastal cities and ports from flooding.
The Antarctic ice sheet is a reservoir of planetary scale. It contains about seventy percent of all fresh water on Earth. The average ice thickness reaches over two kilometers, and in some places nearly five. If all this ice melted, global sea level would rise by approximately fifty-eight meters. Any change in its flow speed resonates far beyond the continent, affecting coastal cities and ecosystems from the equator to the tropics.
The history of the subglacial landscape is deep and strange. The relief began to form long before the ice sheet appeared—more than thirty-four million years ago. Ancient rivers flowed through valleys, water carved through rock, canyons formed, and plateaus were born. After the climate cooled and the ice sheet established, the ice itself further shaped the surface, cutting valleys, smoothing and polishing protrusions. Today this multi-layered foundation determines where ice will flow faster and where it will stall for centuries.
Before this discovery, Antarctica's subglacial relief remained almost as unexplored as the surface of other planets. At one time, the surface of Mars was better mapped than the subglacial world of Antarctica. Traditional radar surveys from aircraft left huge gaps—sometimes up to one hundred and fifty kilometers between flight lines. Entire regions of the continent remained cartographically unknown.
The new method combines the mathematics of ice motion with satellite surface data. It allows not only to 'see' the landscape in the gaps between old profiles but also to understand geomorphology: how a canyon connects to a valley, how a ridge is oriented in space, and which part of the bed will offer the greatest resistance to glacial flow.
Helen Ockenden, lead author of the study, emphasizes the practical significance of the map: it clearly shows where scientists need additional ground measurements to fill in fine details, and where existing data suffice. This saves time and resources for future field expeditions.
The updated map is already beginning to find applications. Researchers are using it to refine models that serve the Intergovernmental Panel on Climate Change (IPCC). More accurate predictions, in turn, give governments a better basis for decisions on adapting coastal areas and planning infrastructure.
A curious detail: Antarctica's hidden relief partly resembles familiar landscapes of Scotland or Scandinavia—plateaus cut by deep valleys, alpine peaks. This similarity is not accidental: it reflects the universality of glacial erosion processes, which operate the same at all latitudes. The resemblance between ancient valleys beneath the Antarctic ice and the mountain landscapes of Europe serves as indirect confirmation of the new maps' accuracy.
