The open ocean beyond any nation's coastline gets its own reckoning here, part of the Our Planet series narrated by David Attenborough. A pod of dolphins works together to outmaneuver a hunting pack of false killer whales, using speed and coordinated maneuvers to protect the group, one of several predator-prey sequences filmed on the high seas. The film moves from sunlit surface waters down toward the deep sea, showing creatures adapted to pressure and darkness that few cameras have captured before, alongside migrating whales, seabirds, and fish that cross entire ocean basins in a single year. Underneath the wildlife footage runs a case about vulnerability: these waters belong to no country, which means no one is directly responsible for protecting them, and the film traces how that gap in accountability lets overfishing, plastic waste, and a warming, more acidic ocean chip away at ecosystems most people never see. It closes on what a functioning international protection system for the high seas could look like.