From the icy oceans of our poles to remote coral islands, David Attenborough has filmed in every ocean habitat on planet Earth. Now, with long-term collaborator Colin Butfield, he shares the story of our last great, critical wilderness, and the one which shapes the land we live on, regulates our climate and creates the air we breathe. Dive into eight unique salt-water habitats, swim through kelp forests, mangroves and coral reefs and down almost 11,000 metres to the deepest corners of the most unexplored ecosystem on our planet. Experience a journey of wonder and discovery, populated by green turtles and blue whales; clownfish and bioluminescent jellyfish; the 'vampire squid' and the 'headless chicken monster' - a strange form of sea cucumber that lives at the very bottom of the ocean. With the warmth, intelligence and awe that characterise all of David Attenborough's landmark series, Ocean shows us a world which is both desperately fragile yet astonishingly resilient, with an extraordinary capacity to repair itself. It's not too late to restore our most vital habitat. If we treat it with respect, our marine world will be even richer and more spectacular than we can imagine.