CAMBRIDGE, England — New satellite, GPS and fracture-mapping research suggests Antarctica’s “Doomsday Glacier” is edging toward a tipping point where its remaining buttressing ice shelf could fail, allowing the massive Thwaites Glacier to speed up and dump more ice into the ocean, Dec. 24, 2025. Scientists say the latest observations show cracks spreading through key shear zones and the shelf losing contact with a stabilizing seafloor ridge that has helped hold the system together.
The findings sharpen concern around a simple but high-stakes question: how long can the last intact parts of Thwaites’ eastern ice shelf resist the push of land ice behind it? A new paper in the Journal of Geophysical Research: Earth Surface tracks the evolution of fractures in the Thwaites Eastern Ice Shelf and argues that shear-zone cracking near the shelf’s “pinning point” is a key driver of destabilization. Separate work in Nature Communications links pulses of subglacial lake discharge to patterns of melting and grounding-line retreat that can weaken the shelf from below.
What the new evidence suggests for the Doomsday Glacier
The Thwaites Eastern Ice Shelf has acted like a brake, resisting flow and slowing how quickly inland ice reaches the sea. But the International Thwaites Glacier Collaboration (ITGC) says that remaining shelf area is “nearing break-up” and could disintegrate within about a decade—removing a major source of resistance for the Doomsday Glacier. The assessment is summarized in the ITGC’s latest public-facing findings report, which describes a shelf that is thinning, cracking and increasingly vulnerable to structural failure (ITGC findings).
Recent reporting has amplified the same theme: the shelf appears to be progressively “unzipping” rather than failing in a single, cinematic snap. Wired described the process as a gradual loss of stability at a critical support point, with fractures multiplying over two decades as speeds increase.
That’s consistent with a broader picture emerging from field campaigns. The British Antarctic Survey, for example, has reported first-of-their-kind mapping of ice-shelf undersides that helps explain where warm water can carve channels and thin ice fastest—weak points that can prime shelves for future cracking (British Antarctic Survey).
Why this matters beyond one glacier
Thwaites already contributes meaningfully to sea-level rise, and researchers warn its retreat could destabilize adjacent glaciers in West Antarctica. The fear is not just what the Doomsday Glacier can do alone, but what it could unlock if its ice shelf’s “braking” role collapses.
Continuity: warnings about the Doomsday Glacier have been building for years
Scientists have been flagging the shelf’s fragility since at least 2021, when monitoring pointed to growing cracks and the possibility that a key ice shelf could fail within a short window—an early signal that structural weakness, not just melting, could drive rapid change (Axios).
In 2024, new observations showed warm water penetrating farther into the glacier system than previously documented, reinforcing that the Doomsday Glacier is vulnerable from both above and below—and that small changes in ocean circulation can have outsized effects (Scientific American).
Researchers caution that exact timelines remain uncertain. But the direction of travel is clearer: more fracturing, less buttressing and faster flow are the ingredients of accelerating loss. For coastal cities planning for higher seas, the message from the Doomsday Glacier is that the risk is not theoretical—and the warning signs are increasingly measurable.
