A 30m-wide rock spike in the middle of the Pacific with nothing around it, so everything comes to it. Giant oceanic mantas with…A 30m-wide rock spike in the middle of the Pacific with nothing around it, so everything comes to it. Giant oceanic mantas with 7m wingspans that deliberately seek out divers' bubbles, silvertip and Galápagos sharks, dolphins that initiate contact, whitetips stacked in ledges like firewood, and humpback song audible through your whole dive in winter. Mexico declared the Revillagigedo Archipelago a 148,000 km² no-take marine park in 2017, the largest in North America. The Socorro mantas are famous for actively soliciting interaction, behaviour documented almost nowhere else. Anchorage: Liveaboard-only; 24h crossing from Cabo San Lucas, biosphere permits required. Hazards: No site-specific hazards noted, brief normally. More