'This is the story of our ocean and we must write its next chapter together. For if we save the sea, we save our world. After a lifetime of filming our planet, I'm sure that nothing is more important.' From the icy seas 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 wilderness - the one which shapes the land we live on, regulates our climate and creates the air we breathe. Dive into eight unique saltwater habitats, swim through kelp forest, mangroves and coral reefs and down almost 11,000 feet 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 'head-less chicken monster' - a strange form of sea cucumber that lives at the very bottom of the ocean. With the warmth, intelligence and awe that characterises 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. A book almost a century in the making, but one that has never been more urgently needed.