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Extreme diver Norbert Wu's Journey into the Antarctic underworld: Showing a medusa or jelly (Desmonema glaciale). It lives near the surface and the bell can reach over one meter in diameter. It is incredibly intricate and beautiful though.
Blue Button Porpita porpita, commonly known as the blue button jellyfish, is not actually a jellyfish, but is a marine organism consisting of a colony of hydroids found in tropical and sub-tropical waters of the Pacific, Atlantic, and Indian oceans.