Tumakohua Pass (South Pass)

Tumakohua Pass — universally known as 'Fakarava South Pass' or simply 'the Wall of Sharks' — is the most famous shark dive in the Pacific, a narrow channel at the southern tip of Fakarava Atoll where more than 700 grey reef sharks gather in the largest natural aggregation of reef sharks documented anywhere on Earth. The pass has been the subject of BBC and National Geographic documentaries and is a protected UNESCO Biosphere Reserve that has drawn shark researchers, underwater photographers, and serious divers for three decades. The dive is a drift on the incoming tide through the 100-meter-wide pass, with divers descending to 25-30 meters and positioning themselves on the pass floor to observe the resident shark wall. The grey reef sharks patrol the pass in layered formations between 15 and 35 meters, hunting the daily procession of groupers, snappers, and bannerfish that use the pass as a highway. In June and July, the pass hosts the annual marbled grouper spawning aggregation — over 17,000 groupers gather in the pass floor during the full moon, triggering one of the most spectacular predator-prey interactions in the world as the resident sharks feed in a multi-day frenzy. Beyond the sharks, the pass hosts Napoleon wrasse, giant trevally, and a rich reef fish community. The coral cover is exceptional — the pass walls and nearby lagoon reefs are covered in hard and soft corals, with gorgonian fans and black coral trees in the deeper sections. Hawksbill turtles and the occasional manta ray appear in the pass during plankton-rich tides. Fakarava South is Advanced Open Water diving with drift experience — currents routinely exceed three knots and the dive demands good buoyancy control. Reached by a 2-hour boat transfer from the main village of Rotoava on Fakarava, or directly from the handful of small dive lodges at the south end of the atoll. Visibility 30-50 meters, water temperatures 26-29°C. Best conditions April through November, with the grouper spawning spectacle in July peaking around the full moon.