What lies below the frozen Arctic ice-sheets? Or in the black holes under the Caribbean Sea? The oceans are Earth's single most important feature. They shape our climate, our culture, our future. Yet we know more about the surface of Mars than we do about Earth's watery depths.

This groundbreaking NRDC documentary explores the startling phenomenon of ocean acidification, which may soon challenge marine life on a scale not seen for tens of millions of years. The film, featuring Sigourney Weaver, originally aired on Discovery Planet Green.

Explorer Paul Rose leads a team of ocean experts in a series of global science expeditions. With him, maritime archaeologist Dr Lucy Blue investigates our past and our relationship with the sea, exploring shipwrecks and lost civilisations; marine biologist and Oceanographer Tooni Mahto seeks the extraordinary life in our oceans today; and environmentalist Philippe Cousteau Jr looks to the future of our oceans and charts the way they're changing.

Filmed in High Definition in some of the most beautiful, diverse and threatened seas on our planet, the team travels across the world to dive the depths of the world's seas and oceans. The planet's seas are changing fast and Oceans builds up a timely global picture of our planet's most magnificent and vital asset.

This documentary series contains all 8 episodes, each around 1 hour long: Sea of Cortez, The Southern Ocean, The Red Sea, The Atlantic, The Indian Ocean, The Indian Ocean Coastal Waters, The Mediterranean Sea and The Arctic Ocean.