Read More: Mysterious Hole in Antarctic Sea Ice Explained by Robots and Seals https://www.vice.com/en_us/article/mb... "These seals are especially helpful to scientists studying Antarctica because they regularly dive around 600 meters below the ocean surface, and sometimes surpass 2,000 meters of depth."
Polynyas https://www.sciencedirect.com/topics/... "Polynyas are large, persistent regions of open water and thin ice that occur within much thicker pack ice, at locations where climatologically, thick pack ice would be expected."
Sea Ice Features : Polynyas https://nsidc.org/cryosphere/seaice/c... "Polynyas are also important resources for wildlife. They provide access between the ocean and atmosphere for a variety of animals, including seals and penguins.
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