Oceans are the largest ecosystems on Earth. What forces keep these water masses in motion?
Writer: Ed Charles Photographer: Dough Anderson, Howard Bourne, Duncan Brake, Tom Crowley, Bertie Gregory, Roger Horrocks, Alastair MacEwen, Hugh Miller, Tom Rowland, John Shier, Alexander Vail , Tom Walker, Richard Wollocombe Cutter: Andreas Lupczyk, Darren Flaxstone Sounddesign: Marcus Wüst Sound: Marcus Wüst Music: Ilan Eshkeri Narrator: Simon Roden Production: BBC Editors Channel: Tom McDonald, BBC; Jack Bootle. BBC; Friederike Haedecke, ZDF
