Beneath the surface of East Antarctica lies the Wilkes Subglacial Basin — 1,400 kilometres of ice that no human being has ever directly studied, yet which holds the power to raise global sea levels by three to four metres. The geological record tells us this basin has collapsed before, during past warm periods not unlike the one humanity is now engineering. We stand at a moment when new technologies make direct study possible for the first time, even as the window for understanding — and perhaps for meaningful response — may be narrowing faster than our models once assumed.
Antarctica's Unknown Ice Basin Poses 4-Meter Sea Level Threat
The melting becomes unstoppable.
Mark
So this basin has never been visited by a scientist? How is that even possible in 2026?
Mimi
It's locked behind sea ice so thick and persistent that ships can't reach it. The nearest you can get by water is 150 kilometres away. And the land approach requires crossing 250 kilometres of ice from the nearest station.
Luke
But we have satellites. We have radar. What exactly are we missing that requires a person to be there?
Mimi
Satellites can't see through ice or ocean. We don't know the pathways warm water uses to reach the ice, or the shape of the ocean floor beneath it. We have almost no temperature data from the water around the basin's edges.
Mark
And that matters because?
Mimi
Because without those measurements, we can't predict how fast the ice will melt. The basin sits in a bowl that slopes deeper away from the ocean. If the ice retreats past a certain point, the melting becomes self-sustaining—unstoppable.
Luke
You're saying it's a tipping point. But do we know where that point is?
Mimi
No. That's part of what we need to find out. We know it happened before, three million years ago, when temperatures were two to three degrees warmer. Sea levels rose six to twenty-three metres.
Mark
And we're heading toward those temperatures by the end of the century?
Mimi
Yes. Which is why understanding the Wilkes basin now matters so much.
Luke
But the expedition itself—is it actually happening, or is this still a proposal?
Mimi
The technology exists now. Australia and New Zealand have the capacity to support it. But it hasn't happened yet. It will take years of multinational effort.
El Pulso
- A basin of ice larger than many nations sits in a precarious geological bowl where the ocean floor deepens away from the coast, meaning any melt could become a self-reinforcing, unstoppable cascade.
- No ship has come within 150 kilometres of the Cook Glacier, no scientist has stood on the basin itself, and the sea ice guarding it has made even satellites nearly useless — leaving a catastrophic unknown at the heart of climate science.
- The Pliocene record is unambiguous: when Earth was two to three degrees warmer, this region collapsed and seas rose by up to twenty-three metres — and current trajectories point toward similar warming by century's end.
- New drilling technology capable of penetrating three kilometres of ice, combined with growing Antarctic operational capacity among Australia, New Zealand, and partner nations, has made a direct expedition feasible for the first time.
- Scientists are now pressing for urgent multinational expeditions before irreversible changes make the question of timelines moot — the race is not just to understand the basin, but to understand it while understanding still matters.
Beneath the surface of East Antarctica lies the Wilkes Subglacial Basin — 1,400 kilometres of ice that no human being has ever directly studied, yet which holds the power to raise global sea levels by three to four metres. The geological record tells us this basin has collapsed before, during past warm periods not unlike the one humanity is now engineering. We stand at a moment when new technologies make direct study possible for the first time, even as the window for understanding — and perhaps for meaningful response — may be narrowing faster than our models once assumed.
A vast bowl of ice stretches across East Antarctica's eastern flank — 1,400 kilometres long, 400 kilometres wide, and sitting on bedrock carved up to 2,000 metres below sea level. The Wilkes Subglacial Basin has never been directly studied by scientists. If its ice fully melted into the ocean, global sea levels would rise three to four metres, redrawing coastlines worldwide. But the deeper alarm is geological: this has happened before.
More than a century ago, Australian explorers Douglas Mawson and Cecil Madigan each attempted to reach the region and turned back. Today, despite satellites and sensors, no one is known to have stood on the basin itself. The sea ice surrounding it is among the thickest and most persistent on Earth. No ship has come within 150 kilometres of the Cook Glacier, one of the basin's major outlets. The nearest research station sits 250 kilometres away.
What makes the basin so dangerous is its shape. The bedrock deepens as you move inland from the coast, meaning that once warming ocean water begins melting ice at the perimeter, it can reach progressively deeper into the basin — melting more ice, accelerating flow, and eventually triggering a self-sustaining collapse that cannot be reversed. Scientists know this mechanism is real because the geological record confirms it happened during the Pliocene, three million years ago, when temperatures were two to three degrees warmer and seas rose by as much as twenty-three metres. The world is on course for similar warming by 2100.
Yet critical data remains absent. Scientists do not know the pathways warm water uses to infiltrate the basin, lack detailed ocean floor maps, and have almost no temperature records for the region. Without these measurements, reliable predictions of collapse timelines are impossible. Satellites captured what appears to have been East Antarctica's first known ice shelf collapse — sometime in the 1970s or 1980s — but vast gaps in understanding persist.
The barrier to direct study is finally weakening. Australia, New Zealand, and other Antarctic nations have developed stronger capacity for remote operations. New drilling technology can now penetrate more than three kilometres of ice to reach ancient sediments containing the biological record of past ocean incursions. These tools make a comprehensive expedition feasible for the first time. Scientists are urging that it happen soon — not because the logistics have become easy, but because the alternative is arriving at irreversible change without ever having understood it.
A vast basin of ice lies beneath the surface of East Antarctica, so remote and so thoroughly locked away by sea ice that no scientist has ever set foot on it. The Wilkes Subglacial Basin stretches 1,400 kilometres by 400 kilometres across the continent's eastern flank. If all the ice stored there melted into the ocean, global sea levels would rise between three and four metres. That alone would reshape coastlines worldwide. But the deeper concern is what happened before.
More than a century ago, Australian explorer Douglas Mawson led a sledging party across hundreds of kilometres of Antarctic ice toward this region. The expedition turned back after a member died. Another Australian, Cecil Madigan, attempted to cross the sea ice into the area years later and also retreated. Neither man reached the ice sheet itself. Today, despite all our satellites and sensors, we still do not know of anyone who has actually been there.
The reason the Wilkes basin matters is geology. The bedrock beneath the ice sits up to 2,000 metres below sea level—a vast bowl carved into the continent. The ice that fills it is thick enough now to keep the ocean at bay, but the ocean is always pressing at its edges. Off East Antarctica, seawater hovers around minus 1.8 degrees Celsius. That is cold, but the ice is colder still. Even small increases in ocean temperature, driven by warming or shifting currents, will melt the ice at the basin's perimeter. As that ice retreats, the ocean can reach deeper into the basin, melting more ice, which flows faster toward the sea. The slope of the bedrock deepens as you move away from the coast. At some point, this retreat becomes self-sustaining. The melting becomes unstoppable.
We know this happened before. Three million years ago, during the Pliocene epoch, global temperatures were two to three degrees Celsius warmer than the pre-industrial baseline. Ice sheets across Antarctica retreated hundreds of kilometres inland. Sea levels rose between six and twenty-three metres. Seafloor sediments preserve the record of this transformation. The world is on track to reach similar warming by the end of this century.
Yet our understanding of the Wilkes basin remains fragmentary. Aircraft equipped with ice-penetrating radar have mapped the basin's shape and confirmed its vulnerability. Satellites captured the collapse of an ice shelf into the ocean sometime in the 1970s or 1980s—East Antarctica's first known collapse of this kind. But vast gaps remain. We do not know the pathways warm ocean water uses to access the ice. We lack detailed maps of the ocean floor. We have almost no data on how ocean temperatures are changing in the region. Without these measurements, scientists cannot reliably predict how fast the ice will melt or over what timeframe the basin might collapse.
The Wilkes basin is among the least observed places on Earth, not because it is impossibly distant but because it is locked behind unusually thick, persistent sea ice. Satellites cannot see through ice or ocean. Scientists must go there in person. No ship has ever come within 150 kilometres of the Cook Glacier, one of the major glaciers draining the basin. The nearest permanent research station sits 250 kilometres away. An expedition by sea would require the most capable icebreakers. An expedition by air would demand years of multinational coordination to establish fuel depots and field camps across one of the planet's harshest environments.
But the barrier is weakening. Australia, New Zealand, and other Antarctic nations have developed better capacity to traverse long distances and support remote operations. New drilling technology can now penetrate more than three kilometres through ice to reach the sediments and bedrock beneath. Scientists can extract samples that contain remnants of ancient ocean species—a record of how far and how fast the ice retreated during warm periods when the ocean flowed into the basin. These tools make a comprehensive expedition feasible for the first time.
For decades, scientists believed Antarctica would take centuries to change. That assumption has proven too optimistic. Land ice is melting faster than models predicted. Sea ice is shrinking. Ice shelves are melting from beneath. The Wilkes basin represents an enormous reservoir of ice sitting in a precarious position, vulnerable to the warming already underway. We cannot afford to wait another hundred years to understand what it will do.
Citas Notables
The ocean is always in contact with the basin's edges, and even small increases in water temperature will melt the ice at the perimeter, allowing the ocean to reach deeper into the basin.— Scientific analysis in the source material
Quieres la nota completa?
Lee el original en The Conversation ↗