With 70% of surface covered by water, Earth doesn't sound to be the right name four our planet. The oceans are the basin of life and the rulers of climate, guardians of an immense variety of nature expressions. Despite all we know, we know very little indeed of what is hidden under the sea. This documentary takes us on an exploration beyond the least unknown and most inaccessible frontiers of our planet: the sea and its inhabitants with their visionary drive.