One of many largest and oldest icebergs ever tracked by scientists has turned blue and is “on the verge of full disintegration,” NASA stated on Thursday.
A23a, a large wall of ice that was as soon as twice the scale of Rhode Island, is drenched in blue meltwater because it drifts within the South Atlantic off the japanese tip of South America, NASA stated in a information launch.
A NASA satellite tv for pc captured a picture of the fading berg the day after Christmas, exhibiting swimming pools of blue meltwater on its floor. A day later, an astronaut aboard the Worldwide Area Station captured {a photograph} exhibiting a more in-depth view of the iceberg, with an excellent bigger soften pool.
NASA
The satellite tv for pc picture means that the A23a has additionally “sprung a leak,” NASA stated, as the burden of the water pooling on the prime of the berg punched via the ice.
Scientists say all indicators point out the so-called “megaberg” could possibly be simply days or even weeks from completely disintegrating because it rides currents which are pushing it towards even hotter waters. Hotter air temperatures throughout this season may additionally velocity up A23a’s demise in an space that ice specialists have dubbed a “graveyard” for icebergs.
“I definitely do not count on A-23A to final via the austral summer time,” retired College of Maryland, Baltimore County scientist Chris Shuman stated in a press release.
Blue and white linear patterns seen on A23a are probably associated to striations, that are ridges that have been scoured a whole bunch of years in the past when the iceberg was a part of the Antarctic bedrock, NASA stated.
NASA 
“The striations fashioned parallel to the path of movement, which in the end created delicate ridges and valleys on the highest of the iceberg that now direct the movement of meltwater,” stated Walt Meier, a senior analysis scientist on the Nationwide Snow & Ice Knowledge Heart.
When the berg indifferent from Antarctica in 1986, it was about 4,000 sq. kilometers and hosted a Soviet analysis station. It remained caught for over 30 years earlier than lastly breaking free in 2020, its lumbering journey north typically delayed by ocean forces that saved it spinning in place.
In 2023, the British Antarctic Survey posted a time-lapse of satellite tv for pc imagery, exhibiting the iceberg’s motion. In January 2025, it was on a collision course with a distant penguin colony however fortuitously, it didn’t make influence.
Final summer time, a number of massive chunks of ice broke off A23a because it moved into comparatively heat summer time situations. Based on present estimates from the U.S. Nationwide Ice Heart, in early January 2026, the berg’s space is 1,182 sq. kilometers — nonetheless bigger than New York Metropolis however a fraction of its preliminary dimension.
“I am extremely grateful that we have had the satellite tv for pc assets in place which have allowed us to trace it and doc its evolution so carefully,” stated Shuman. “A-23A faces the identical destiny as different Antarctic bergs, however its path has been remarkably lengthy and eventful. It is arduous to consider it will not be with us for much longer.”
