Sunday, 30 March 2025

Antarctic Iceberg Breaks Away to Reveal a Never-Before-Seen Ecosystem

30 March 2025, By C. CASSELLA

An entire ecosystem has been discovered nearly 230 meters deep at an area of the seabed recently covered by ice.
 (ROV SuBastian/Schmidt Ocean Institute)

A colossal iceberg the size of Chicago has broken from a floating glacier in Antarctica, and like a retractable roof at a stadium, the drifting structure has opened up a hidden habitat to the elements.

Researchers working on a ship in the region in early 2025 quickly hurried to the newly exposed site, which sits near the edge of a floating glacier known as the George VI Ice Shelf.

Satellite imagery showing the iceberg calved from George VI Ice Shelf in the Bellingshausen Sea on 19 January 2025.
 (Schmidt Ocean Institute/NASA)

Driving a remotely operated vehicle named SuBastian down into the blue, where the iceberg used to sit, an international team of scientists discovered a thriving ecosystem of sponges, anemones, hydroids, and coral never before seen by humans.

A group of sponges attached to a portion of the seabed that was until recently covered by the George VI Ice Shelf. 
(ROV SuBastian/Schmidt Ocean Institute)

"We seized upon the moment, changed our expedition plan, and went for it so we could look at what was happening in the depths below," recalls expedition co-chief scientist Patricia Esquete of the Centre for Environmental and Marine Studies (CESAM) and the Department of Biology (DBio) at the University of Aveiro, Portugal.

"We didn't expect to find such a beautiful, thriving ecosystem."

Very little is currently known about what lives on the Antarctic seabed below thick chunks of floating ice. Without sunlight or raining nutrients from above, these deep ecosystems are thought to survive purely on ocean currents, which slip below thick ice shelves.

A solitary hydroid drifts in currents approximately 380 meters deep at the recently exposed. 
(ROV SuBastian/Schmidt Ocean Institute)

It will probably take scientists years to describe all of the new species they have potentially found in this special habitat and the surrounding Bellingshausen Sea, let alone figure out how life survives beneath the cover of ice some 150 kilometers thick.


The tentacles of a solitary hydroid drift in currents 360 meters deep at the newly exposed seabed near the George VI Ice Shelf.
 (ROV SuBastian/Schmidt Ocean Institute)



"Based on the size of the animals, the communities we observed have been there for decades, maybe even hundreds of years," says Esquete.

Take the large sponge in the image below, for instance. Sponges often grow only a few centimeters a year, which means this individual could potentially be decades or even centuries old. It exists 230 meters deep, and until very recently, it was closed off from the rest of the world by a big icy roof.


A large sponge, a cluster of anemones, and other life is seen nearly 230 meters deep at an area of the seabed that was until recently covered by ice. 
(ROV SuBastian/Schmidt Ocean Institute)



For days on end, Su Bastian explored the newly exposed seafloor community, mapping the region and taking sediment cores and numerous samples for further analysis.

Co-leader of the expedition, Aleksandr Montelli from University College London, says this is the first time, to his knowledge, that "a comprehensive and interdisciplinary study like this was completed in a sub-ice shelf environment".

Deploying ROVs below floating glaciers is tricky business. Current navigation systems must rely on acoustics rather than GPS because of the thickness of the ice. Extreme pressures and temperatures merely add to the challenge.

A stalk of deep-sea coral found 1,200 meters deep in the recently revealed seabed area.
 (ROV SuBastian/Schmidt Ocean Institute)

"The science team was originally in this remote region to study the seafloor and ecosystem at the interface between ice and sea," says Schmidt Ocean Institute Executive Director, Jyotika Virmani.

"Being right there when this iceberg calved from the ice shelf presented a rare scientific opportunity. Serendipitous moments are part of the excitement of research at sea – they offer the chance to be the first to witness the untouched beauty of our world."


Patricia Esquete inspects a possible new species of isopod that was sampled from the bottom of the Bellingshausen Sea off Antarctica. 
(Alex Ingle/Schmidt Ocean Institute)



In a nearby region of the Bellingshausen Sea, which lost its ice shelf years before, the same team of researchers has found congregating corals, icefish, crabs, giant sea spiders, isopods jellyfish, and octopuses.

The findings suggest that when floating ice moves away from a seabed, new life quickly moves in.


The Life of Earth

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