New Caledonia sits behind one of the world's longest barrier reefs, and this episode of the Somewhere on Earth series stays close to that lagoon and the people who live around it. In Noumea, scientists track sharks to understand their role in keeping the reef ecosystem balanced. On Lifou, in the Loyalty Islands, Marcel Lapachas of the Jokin tribe offers a way into Kanak legends and traditions that have survived largely unchanged. On Ouvea, the shark reappears as a sacred totem for several clans, and Germain Boussarie, who has chased an underwater life since childhood in southern France, dives to see the animal the way islanders regard it. Aerial footage carries viewers over Grande Terre's open landscapes, and freefly diver Oana Larue supplies the adrenaline segment, filmed in the weightless seconds before her parachute opens. The film moves between marine biology, custom, and extreme sport without settling on one, using New Caledonia's geography as the connecting thread.