A decade and a half ago, Pixar's "Finding Nemo" awed both the young and the old with its depiction of a an astonishing underwater world. This beautiful animation might only be a fantasy in the near future though, as the world's seas are in great trouble due to human activity, and the corals are dying at unprecedented speed. It was just a year ago the largest coral in the world, the Great Barrier Reef, was cautioned to be in a terminal condition. In this film filled with mesmerising images, a team of scientists, divers and photographers set out to discover, if and how these underwater miracles might be saved.