Hundreds of scalloped hammerheads in a single school, silky sharks in the hundreds, Galápagos sharks, whale sharks, and the…Hundreds of scalloped hammerheads in a single school, silky sharks in the hundreds, Galápagos sharks, whale sharks, and the only reliable place on earth to see the short-nosed ragged-tooth shark, a deep-water species that appears here at 40m and essentially nowhere else accessible. A UNESCO World Heritage site since 2006 and one of the largest no-fishing zones in the Eastern Tropical Pacific, patrolled by a Colombian navy post on the rock itself. It forms a migratory corridor with Cocos, Coiba and the Galápagos; sharks tagged at one turn up at the others. Anchorage: No anchorage. Liveaboard expedition only, with a Colombian navy detachment on the rock. Hazards: Extreme current with genuine downcurrent risk, 270nm from land, no chamber. Advanced or technical experience and a licensed expedition only. Plus