The Thwaites “Doomsday Glacier” in Antarctica is melting faster than scientists expected.
Credit : www.jpl.nasa.gov
For decades, climate scientists have warned about Antarctica’s most unstable glacier. Now, as the ice melts faster than expected, a once-unthinkable idea is being discussed out loud: building a massive underwater barrier to hold the ocean back.
The glacier is Thwaites, better known as the Doomsday Glacier. It sits in West Antarctica, covers an area roughly the size of Great Britain, and plays a crucial role in keeping the surrounding ice sheet in place. If it goes, the consequences won’t stay in Antarctica.
Thwaites is already contributing around four per cent of global sea-level rise each year. That number is climbing as warmer ocean water creeps further under the ice. Scientists agree on one thing: this glacier is changing faster than they once believed.
And that urgency is why radical ideas are now being floated.
Why Thwaites Glacier has become a global concern
The problem with Thwaites isn’t just how much ice it holds, but where the melting is happening. Warm ocean currents are eroding the glacier from below, weakening the ice shelf that acts like a brace, slowing its movement into the sea.
If that support fails, Thwaites could begin to retreat rapidly. In the worst-case scenario, its collapse could eventually lead to around 65 centimetres of global sea-level rise. Even small increases matter. Each centimetre exposes millions of people to a higher risk of coastal flooding.
That’s why scientists see Thwaites as a tipping point. If it destabilises completely, other glaciers in West Antarctica could follow.
Until recently, the focus was almost entirely on emissions cuts. Necessary, yes – but slow. Now, some researchers are asking whether physical intervention might buy time.
The underwater wall idea no one expected to hear
The proposal comes from an international group of scientists and engineers working on what they call the Seabed Anchored Curtain Project. The idea is simple in theory and daunting in practice.
They want to place a huge, flexible barrier on the seabed in front of vulnerable parts of the glacier. The structure would rise roughly 150 metres from the ocean floor and stretch for about 80 kilometres, acting as a shield to reduce the flow of warm water beneath the ice.
Supporters stress that this would not “stop” climate change. Instead, it could slow the melting enough to prevent a sudden collapse.
The team behind the idea includes researchers from several major universities and engineering groups with experience in offshore construction. For now, they are focusing on feasibility: materials, anchoring systems, and whether such a structure could survive Antarctic conditions.
A three-year research phase is planned, with prototype testing likely to take place in Norwegian fjords. The group is also seeking around $10 million (€8.4 million) to fund early development.
Critics, meanwhile, warn of the risks. Interfering with ocean systems at this scale could have unintended consequences, and there is no guarantee it would work as hoped.
Still, the fact that respected scientists are discussing the idea at all reflects how serious the situation has become.
Drilling into the ice to understand what’s really happening
While engineers debate possible defences, scientists on the ground are racing to gather better data.
Recently, research teams from the UK and South Korea reached one of the most remote and unstable sections of Thwaites Glacier. Using hot-water drills, they bored through the ice to install instruments deep below the surface – where the ocean meets the glacier’s base.
This is not routine work. The area is riddled with crevasses, and the ice moves quickly. But the payoff could be crucial.
For the first time, scientists will receive daily, real-time measurements showing how warm water is melting the glacier from below. The instruments will transmit data via satellite for at least a year.
“This is one of the most unstable glaciers on the planet,” said Dr Peter Davis, a physical oceanographer at the British Antarctic Survey. “We’re finally able to observe what’s happening where it matters most.”
The findings could reshape predictions about future sea-level rise – and help determine whether drastic ideas like underwater barriers are unrealistic fantasies or uncomfortable necessities.
For now, there is no wall, no construction, no final decision. Just a growing sense that the clock is ticking faster than anyone expected.
And that the Doomsday Glacier may force humanity to consider solutions once dismissed as impossible.
