The melting ice caps have let something out: a sound. A sound loud enough to be heard across the Pacific. It's called Julia, and it may be history's greatest discovery, but some songs are better unheard. Curiousity begs to be sated, as the National Oceanic and Atmospheric Administration work to find the source of this unusual sound, the team they put together to explore the southern pole find themselves in a struggle for survival that pits them against time, against each other, and against something that defies definition.