International scientific teams have discovered a massive, fan-shaped geological structure hidden beneath the East Antarctic Ice Sheet [1].

The discovery of the East Antarctic Fan-shaped Basin Province provides a new understanding of the continent's ancient geology. By linking several previously known subglacial basins into a single network, the find allows researchers to better reconstruct the region's geological history and past climate dynamics [1, 3].

Researchers, including geophysicists and glaciologists, identified the structure using advanced radar and imaging techniques [1, 3]. These tools allowed the teams to map the subglacial topography through layers of ice that reach thicknesses of up to three kilometers [1]. The mapping process revealed that the province acts as a unifying system for various basins that were previously viewed as isolated features [2, 4].

Reports regarding the discovery were published early this month, with a detailed release appearing June 4, 2026 [3]. The identification of this continent-scale structure suggests that the crustal architecture of East Antarctica is more interconnected than previous models indicated [2, 4].

Scientists said the ability to see through the ice sheet is critical for understanding how the continent evolved. The fan-shaped basin suggests specific patterns of sediment deposition, and tectonic activity that occurred long before the ice sheet formed [1, 3]. This geological framework helps researchers determine how the land beneath the ice has shifted over millions of years and how those shifts influenced global sea levels and weather patterns [2, 4].

The international effort relied on the integration of multiple imaging datasets to confirm the scale of the province [1, 3]. This collaborative approach has turned fragmented data into a comprehensive map of the hidden landscape [2, 4].

“The discovery links several known subglacial basins into a single network.”

This discovery shifts the geological model of East Antarctica from a series of disconnected basins to a unified, continent-scale province. Understanding the structural connectivity of the land beneath the ice is essential for predicting how the ice sheet may respond to future temperature changes, as the underlying topography dictates how ice flows and retreats.