In a ground-breaking discovery, glacial geologists in Antarctica have discovered fish and other aquatic animals living in perpetual darkness and cold — beneath a 740 metre-thick roof of ice. The animals inhabit a wedge of seawater only 10 metres deep, sealed between the ice above and a barren, rocky seafloor below. The location is so remote and hostile that scientists expected to find nothing but scant microbial life, the scientific journal Nature reported.