<div class="" data-article-body="true"><p class="mb-4 text-lg md:leading-8 break-words">One of the largest and oldest icebergs ever tracked by scientists has turned blue and is "on the verge of complete disintegration," NASA said on Thursday.</p><p class="mb-4 text-lg md:leading-8 break-words"><span class="link"><a href="https://www.cbsnews.com/news/iceberg-a23a-could-collide-antarctic-penguin-island-south-georgia/?ftag=YHF4eb9d17" rel="nofollow noopener" target="_blank" data-ylk="slk:A23a;elm:context_link;itc:0;sec:content-canvas" class="link ">A23a</a></span>, a massive wall of ice that was once twice the size of Rhode Island, is drenched in blue meltwater as it drifts in the South Atlantic off the eastern tip of South America, NASA said in a <a href="https://science.nasa.gov/earth/earth-observatory/meltwater-turns-iceberg-a-23a-blue/?ftag=YHF4eb9d17" rel="nofollow noopener" target="_blank" data-ylk="slk:news release;elm:context_link;itc:0;sec:content-canvas" class="link ">news release</a>.</p><p class="mb-4 text-lg md:leading-8 break-words">A NASA satellite captured an image of the fading berg the day after Christmas, showing pools of blue meltwater on its surface. A day later, an astronaut aboard the International Space Station captured a photograph showing a closer view of the iceberg, with an even larger melt pool.</p><figure class="relative mb-4"><div class="relative"><img alt="Iceberg A23a has turned blue and is " loading="lazy" width="960" height="640" decoding="async" data-nimg="1" class="rounded-lg" style="color:transparent" src="https://s.yimg.com/ny/api/res/1.2/JQamKUekLWWpOg1kI17aEw--/YXBwaWQ9aGlnaGxhbmRlcjt3PTk2MDtoPTY0MDtjZj13ZWJw/https://media.zenfs.com/en/cbs_news_897/582e3e37328b38df38b155f114b171c8"><button aria-label="View larger image" class="group absolute bottom-0 size-full" data-ylk="elm:expand;itc:1;sec:image-lightbox;slk:lightbox-open;"><span class="absolute bottom-3 right-3 rounded-full bg-white p-3 opacity-100 shadow-elevation-3 transition-opacity duration-300 group-hover:block group-hover:opacity-100 md:p-[17px] lg:bottom-6 lg:right-6 lg:bg-white/90 lg:p-5 lg:opacity-0 lg:shadow-none"><svg viewbox="0 0 22 22" aria-hidden="true" class="size-4 lg:size-6" width="22" height="22"><path d="M12.372.92c0-.506.41-.916.915-.916L21 0l-.004 7.712a.917.917 0 0 1-1.832 0V3.183l-6.827 6.828-1.349-1.348 6.828-6.828h-4.529a.915.915 0 0 1-.915-.915M1.835 17.816l6.828-6.828 1.349 1.349-6.829 6.827h4.529a.915.915 0 0 1 0 1.831L0 21l.004-7.713a.916.916 0 0 1 1.831 0z"></path></svg></span></button><dialog aria-label="Modal Dialog" aria-modal="true" class="fixed bottom-0 left-0 right-0 top-0 z-4 size-full max-h-none max-w-none bg-white hidden"></dialog></div><figcaption class="relative text-sm mt-1 pr-2.5"><div style="max-height:none;overflow:visible">Iceberg A23a has turned blue and is </div></figcaption></figure><p class="mb-4 text-lg md:leading-8 break-words">The satellite image suggests that the A23a has also "sprung a leak," NASA said, as the weight of the water pooling at the top of the berg punched through the ice.</p><p class="mb-4 text-lg md:leading-8 break-words">Scientists say all signs indicate the so-called "megaberg" could be just days or weeks from totally disintegrating as it rides currents that are pushing it toward even warmer waters. Warmer air temperatures during this season could also speed up A23a's demise in an area that ice experts have dubbed a "graveyard" for icebergs.</p><p class="mb-4 text-lg md:leading-8 break-words">"I certainly don't expect A-23A to last through the austral summer,"  retired University of Maryland, Baltimore County scientist Chris Shuman said in a statement.</p><p class="mb-4 text-lg md:leading-8 break-words">Blue and white linear patterns visible on A23a are likely related to striations, which are ridges that were scoured hundreds of years ago when the iceberg was part of the Antarctic bedrock, NASA said.</p><figure class="relative mb-4"><div class="relative"><img alt="Iceberg A23a has turned blue and is " loading="lazy" width="960" height="547" decoding="async" data-nimg="1" class="rounded-lg" style="color:transparent" src="https://s.yimg.com/ny/api/res/1.2/qh8ap8IyA075_no8AdNFHA--/YXBwaWQ9aGlnaGxhbmRlcjt3PTk2MDtoPTU0NztjZj13ZWJw/https://media.zenfs.com/en/cbs_news_897/c4df008a48e89de8ae40b9ba537140a1"><button aria-label="View larger image" class="group absolute bottom-0 size-full" data-ylk="elm:expand;itc:1;sec:image-lightbox;slk:lightbox-open;"><span class="absolute bottom-3 right-3 rounded-full bg-white p-3 opacity-100 shadow-elevation-3 transition-opacity duration-300 group-hover:block group-hover:opacity-100 md:p-[17px] lg:bottom-6 lg:right-6 lg:bg-white/90 lg:p-5 lg:opacity-0 lg:shadow-none"><svg viewbox="0 0 22 22" aria-hidden="true" class="size-4 lg:size-6" width="22" height="22"><path d="M12.372.92c0-.506.41-.916.915-.916L21 0l-.004 7.712a.917.917 0 0 1-1.832 0V3.183l-6.827 6.828-1.349-1.348 6.828-6.828h-4.529a.915.915 0 0 1-.915-.915M1.835 17.816l6.828-6.828 1.349 1.349-6.829 6.827h4.529a.915.915 0 0 1 0 1.831L0 21l.004-7.713a.916.916 0 0 1 1.831 0z"></path></svg></span></button><dialog aria-label="Modal Dialog" aria-modal="true" class="fixed bottom-0 left-0 right-0 top-0 z-4 size-full max-h-none max-w-none bg-white hidden"></dialog></div><figcaption class="relative text-sm mt-1 pr-2.5"><div style="max-height:none;overflow:visible">Iceberg A23a has turned blue and is </div></figcaption></figure><p class="mb-4 text-lg md:leading-8 break-words">"The striations formed parallel to the direction of flow, which ultimately created subtle ridges and valleys on the top of the iceberg that now direct the flow of meltwater," said Walt Meier, a senior research scientist at the National Snow &amp; Ice Data Center.</p><p class="mb-4 text-lg md:leading-8 break-words">When the berg detached from Antarctica in 1986, it was about 4,000 square kilometers and hosted a Soviet research station. It remained stuck for over 30 years before finally breaking free in 2020, its slow journey north sometimes held up by ocean forces that stopped its movement.</p><p class="mb-4 text-lg md:leading-8 break-words">In 2023, the British Antarctic Survey posted a <span class="link"><a href="https://www.cbsnews.com/news/worlds-largest-iceberg-s23a-is-on-the-move-for-first-time-in-37-years/?ftag=YHF4eb9d17" rel="nofollow noopener" target="_blank" data-ylk="slk:time-lapse of satellite imagery;elm:context_link;itc:0;sec:content-canvas" class="link ">time-lapse of satellite imagery</a></span>, showing the iceberg's movement. In January 2025, it was on a <span class="link"><a href="https://www.cbsnews.com/news/iceberg-a23a-could-collide-antarctic-penguin-island-south-georgia/?ftag=YHF4eb9d17" rel="nofollow noopener" target="_blank" data-ylk="slk:collision course;elm:context_link;itc:0;sec:content-canvas" class="link ">collision course</a></span> with a remote penguin colony but fortunately, it did not make impact.</p><p class="mb-4 text-lg md:leading-8 break-words">Last summer, multiple large chunks of ice broke off A23a as it moved into relatively warm summer conditions. 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