Seven hundred grey reef sharks stacked in the pass mouth in ranks like a squadron, the densest shark aggregation on the planet…Seven hundred grey reef sharks stacked in the pass mouth in ranks like a squadron, the densest shark aggregation on the planet, filmed for 'Blue Planet II'. Drift in on the incoming tide through coral canyons; in June, 20,000 spawning grouper and the sharks that come to eat them. Fakarava is a UNESCO Biosphere Reserve, and French Polynesia declared its entire 5-million-km² EEZ a shark sanctuary in 2012. The result is a functioning predator-dominated reef, the ecological baseline almost nowhere else still has. Anchorage: Anchor inside the lagoon off Tetamanu in sand, one of the great Pacific anchorages. Hazards: No site-specific hazards noted, brief normally. Plus