A giant iceberg that broke away from an Antarctic glacier has revealed a thriving ecosystem never before observed in its depths.
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Iceberg A-84 , which is about the size of Chicago, broke away from Antarctica's George VI Glacier on January 13, 2025 .
After being alerted to the iceberg's movement via satellite imagery, scientists aboard the Schmidt Institute of Oceanography's research vessel Falkor rushed to the area. Just 12 days later, they arrived to find an ecosystem beneath the glacier that had never been seen before in this part of Antarctica, full of giant sponges, fish, enormous sea spiders and octopuses exposed for the first time.
The area beneath Antarctica's ice, which reaches about 150 meters deep, remains little known, but scientists suspect it is filled with a gigantic network of rivers, lakes and estuaries. However, it was only recently that this hidden world was discovered to be home to life.
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Without sunlight or nutrients falling from above, this life is likely fueled by deep ocean currents moving beneath the glacier's surface, although scientists are not sure if this is the only mechanism at work.
To explore the previously hidden ecosystem of the glacier, scientists used a remotely operated submarine (called SuBastian), which, due to the thick layer of Antarctic ice blocking GPS signals, navigated using sound waves to reach the ocean.
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Once there, the submersible collected biological and geological samples from the area's coral reefs and sea sponges. Some of these creatures were so large that they suggested they had been growing for centuries. Researchers also used other autonomous vehicles to study how melting ice is affecting the area.
Source: livescience
