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Satellite Images Reveal That Iceberg A23a, Which Was Three Times Larger Than New York, Is Showing Vibrant Blue Lakes on Its Surface, Indicating Its Definitive Fragmentation in the Southern Atlantic
The mega-iceberg A23a, considered for decades the largest ice block on the planet, has entered its final phase of existence by transforming into a type of “blue mass” visible from space. The latest images captured by NASA satellites reveal a structure completely different from the one that made the iceberg famous since the 1980s, indicating that its disappearance is merely a matter of time. This information was released by international scientific outlets based on records from NASA, the National Snow & Ice Data Center (NSIDC), and researchers affiliated with universities in the United States.
At almost 40 years of existence, A23a is a true record holder among icebergs. It broke away from the Filchner-Ronne Ice Shelf in Antarctica during the summer of 1986, becoming one of the oldest monitored icebergs. For much of its life, it maintained colossal dimensions, reaching to be three times larger than New York City, and it officially held the title of largest iceberg in the world several times.
However, images captured on December 26 by the Terra satellite from NASA show an A23a almost unrecognizable. What was once a compact white mass now appears covered by pools of intense blue water, surrounded by thick white ice edges, called ramparts, along with a large number of smaller fragments around it, highlighting an accelerated process of structural degradation.
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A Unique Iceberg: Trapped for Decades and Almost Unchanged
Unlike most icebergs, which detach and quickly begin to fragment, A23a followed an unusual path. Soon after separating from the Filchner-Ronne Ice Shelf in 1986, its submerged base got stuck to the ocean floor, preventing its displacement. As a result, the iceberg remained practically motionless for over 30 years, undergoing very little reduction in size during this period.
This prolonged “imprisonment” helped preserve its structure, making A23a a true relic of Antarctic ice. Only in 2020 did it finally free itself from the ocean bed and begin its slow journey away from Antarctica, becoming closely monitored by scientists worldwide.
Subsequently, its trajectory continued to be marked by unusual events. The iceberg ended up caught in a large oceanic gyre, where it spun around its own axis for months. This behavior attracted the attention of the scientific community, as such movements accelerate internal tensions in the ice structure.
The Dangerous Route Toward South Georgia and the Beginning of Fragmentation
After escaping the oceanic gyre in December 2024, A23a began to move rapidly toward South Georgia in the Southern Atlantic. This movement raised concerns among researchers, who feared that the iceberg might become stranded again, this time near the island, causing severe ecological impacts.
South Georgia is home to vast colonies of penguins, seals, and seabirds, which highly depend on free access to the ocean for feeding. An iceberg the size of A23a could block natural shipping routes, jeopardizing the survival of these species. Fortunately, this extreme scenario was avoided.
Just before reaching the island, in May 2025, the iceberg began to fragment rapidly, breaking apart into large blocks. The largest remaining fragment then moved northward, entering progressively warmer waters of the Southern Atlantic, influenced by currents from South America.
Since then, the melting process has intensified rapidly.
The “Blue Mass” Seen from Space and the Final Structural Collapse
The latest images show that A23a now has about one-third of its original size. Its surface is covered with melt ponds, known as melt ponds, which appear when the ice loses its structural integrity. According to Ted Scambos, a climate scientist at the University of Colorado Boulder, these ponds align in bands due to the weight of accumulated water, which forces the opening of internal cracks.
These cracks, according to Walter Meier, a senior researcher at NSIDC, follow parallel patterns to ancient grooves on the bottom of the iceberg. These grooves were carved over centuries of ice displacement over the ground, when A23a was still part of the Filchner-Ronne Ice Shelf. For retired glaciologist Chris Shuman, former University of Maryland, it is impressive that these marks are still visible after so long.
Additionally, the iceberg appears surrounded by an area of ice mélange, a kind of gray slurry composed of small fragments of ice and water, which likely leaked from its base. Hundreds of mini-icebergs around reinforce that the disintegration process is at an advanced stage.
An additional image, captured on December 27 by an astronaut aboard the International Space Station (ISS), suggests that the vibrant blue stripes have already begun to disappear, giving way to a more uniform water pool, another clear sign of imminent collapse.
Currently, it is unclear how much of A23a still remains intact or if a significant part has already completely dissolved into the ocean.
Throughout its long existence, A23a has repeatedly reclaimed the title of largest iceberg in the world, most recently in June 2023, after the fragmentation of iceberg A-76A. It lost this title again in September 2025, shortly after the incident involving South Georgia. Today, the largest iceberg on the planet is D15A, with about 1,200 square miles (3,100 km²), a few hundred square miles smaller than A23a at its peak.
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