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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →The Wilkes Subglacial Basin beneath East Antarctica could contribute an estimated 3–4 metres to global mean sea level if its ice were lost. A 2026 scientific review warns that the basin’s shape may make it vulnerable to unstable retreat as the climate warms—but it does not say a collapse is happening now, or establish when one might begin.
What is the threat beneath Antarctica?
The Wilkes Subglacial Basin is an ice-covered depression in East Antarctica. Parts of the ice sheet above it rest on bedrock below sea level, making the region “marine-based.” That geometry can leave the ice vulnerable to ocean water reaching the grounding zone, where ice grounded on the seabed transitions to floating ice.
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The region is not an entirely unmapped part of the continent. The main gaps concern direct measurements: scientists lack in-situ seafloor mapping near key glaciers and have limited information about ocean conditions that could drive melting. Matt King, lead author of the review and a professor at the University of Tasmania, described it as “arguably the last unexplored place in Antarctica.” The university’s summary quotes King saying no ship has been within 150 kilometres of the front of Cook Glacier.
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What evidence points to instability?
Clues from the past
The review synthesizes geological evidence and ice-sheet modeling indicating that substantial retreat in the basin occurred during the Pliocene and other warm periods. Those records show that the region has changed substantially in the past, but they do not establish a precise temperature threshold for future retreat.
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Changes observed today
Researchers also describe multidecadal retreat of grounding lines and thinning or collapse of key ice shelves around the basin. However, these observations have not been accompanied by clear upstream lowering of the ice-sheet surface. They are evidence of change, not proof that rapid, basin-wide collapse is underway.
What models project
For future emissions scenarios, the review describes retreat rates of up to about 1 kilometre per year beyond bedrock pinning points—places where the bedrock can help hold back the ice. This is a modeled projection, not a measured current rate. The review raises the possibility that change could be committed to during this century and continue over millennia, but its timing remains uncertain.
How much could the basin raise sea levels?
The 2026 review estimates that the basin holds enough ice to contribute 3–4 metres to global mean sea-level rise if lost. This is a conditional estimate of the ice’s potential contribution, not a forecast that sea level will rise by that amount on a particular schedule. The review does not establish when major retreat might occur or what warming threshold would trigger it.
That sea-level figure describes the potential consequence of losing the basin’s ice. It is separate from the modeled retreat rate: one is a possible total contribution to global sea level, while the other is a projected speed of retreat beyond pinning points under future emissions scenarios.
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Why scientists say the region needs closer study
The review calls for a coordinated, multinational, multiyear program of fieldwork and modeling. Better seafloor maps, ocean measurements and observations of ice and grounding-line change would help researchers assess how vulnerable the basin is and improve estimates of how quickly it could respond. The University of Tasmania says major observation gaps currently prevent confident predictions of retreat speed and possible climate thresholds.
King said the evidence from past warm periods is “enough to ring an alarm bell” about the need to understand the basin better. The warning is about a consequential risk that remains poorly observed—not a claim that an abrupt catastrophe is imminent.
Quick Recap
Sources
- Nature Reviews Earth & Environment: “Dynamic instability of the Wilkes Subglacial Basin Ice Sheet, East Antarctica”, published September 30, 2026. The article is a review synthesizing multiple lines of evidence; its full text is subscription content.
- University of Tasmania summary of the review and the observation gaps identified by its lead author.
- Gizmodo report on the study and the Wilkes Subglacial Basin.
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