For centuries, Inuit in the Arctic have lived on and around the frozen ocean. Now, as climate change is rapidly melting the sea ice between Canada and Greenland, the outside world sees unprecedented opportunity. Oil and gas deposits, faster shipping routes, tourism, and fishing all provide financial incentive to exploit the newly opened waters. But for more than 100,000 Inuit, an entire way of life is at stake. Development here threatens to upset the delicate balance between their communities, land, and wildlife. Divided by aggressive colonization and decades of hardship, Inuit in Canada and Greenland are once again coming together, fighting to protect what will remain of their world. The question is, will the world listen?

The documentary follows leaders and community members from the tropical Pacific island nation who are making bold changes to move the needle on marine protection. With a population of under 2,000 people and a marine reserve covering 40% of its waters, Niue has demonstrated the ways in which traditional knowledge and contemporary science can live in harmony for the benefit of people and the planet.

David Attenborough takes viewers on a breathtaking journey showing there is nowhere more vital for our survival, more full of life, wonder, or surprise, than the ocean. Through spectacular sequences featuring coral reefs, kelp forests and the open ocean, Attenborough shares why a healthy ocean keeps the entire planet stable and flourishing.