Scientists seeking lost ship in Antarctica find vast underwater fish nest city

An Antarctic expedition, initially tasked with locating the legendary sunken ship HMS Endurance, stumbled upon an unexpected and remarkable discovery beneath an iceberg: hundreds of meticulously arranged fish nests.

The scientific team, aboard the SA Agulhas II in 2019, was exploring the Weddell Sea, an area recently exposed by the calving of the massive A68 iceberg in 2017. This opening provided a rare opportunity to study an ecosystem isolated for years.

Using a remotely operated vehicle named Lassie, researchers captured images of the seafloor. What initially appeared as strange geometric patterns revealed themselves to be over a thousand nests constructed by Antarctic icefish. These nests formed distinct shapes, including circles, lines, and U-shapes, spread across the seabed.

While the expedition did not find the HMS Endurance, which was located three years later, the discovery of this unique breeding ground offered unprecedented insights into life at the extreme southern limits of the planet. The findings underscore how much remains unknown about the deep-sea environments of Antarctica.

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The sea ice, in particular, posed a challenge, as there was an accumulation of ice in that area. We were heading directly towards it, navigating around icebergs as we went.