While attempting to locate Shackleton’s sunken ship in 2019, researchers unexpectedly documented a strange sight–a sprawling, geometric complex of over 1,000 icefish nests. The fish nests are described in a study published on October 29 in the journal Frontiers. The initial discovery occurred six years ago aboard the polar research vessel SA Agulhas II during its visit to the Western Weddell Sea. These floating barriers hold back the Antarctic Ice Sheet’s expansive ice flows, and their disappearance directly ties to rising global sea-levels. The team didn’t return with the ship’s suspected location, but they did manage to collect extensive video from the bottom of the Weddell Sea.