Scuba Diving, Cozumel

Cozumel sits on the Mesoamerican Barrier Reef, the second-largest reef system in the world, and its western coastline within Cozumel Reefs National Marine Park is known for strong, current-driven drift diving rather than anchored reef dives. Columbia Reef, Palancar Reef, and Santa Rosa Wall combine dramatic wall drop-offs, swim-through canyons, and dense coral formations with consistently good visibility, often exceeding 30 metres. Diving here ranges from open-water-level reef dives in shallower sections to deeper wall dives suited to advanced divers comfortable with drift currents; dive shops typically require an open-water certification at minimum and recommend an advanced certification or prior drift-diving experience for the deeper wall sites. Tanks, weights, and dive guides are included in standard two-tank trips; divers should bring or rent their own BCD, regulator, wetsuit (3mm is common given warm water), and a surface marker buoy for drift dives where the boat follows bubbles rather than anchoring. Established Cozumel operators have decades of experience with the island's drift-diving conditions and are typically PADI or SSI five-star affiliated, with dive guides trained in current management and buddy separation procedures specific to Cozumel's reefs. Safety briefings before each dive cover current direction and strength, the boat's pickup procedure for drifting groups, and the use of the marker buoy to signal position at the surface; guides carry surface signaling devices and maintain a headcount at each ascent. Water stays warm and diveable year-round, but visibility and diving conditions are typically best from May through September, which also coincides with increased sea turtle nesting activity on the reefs; winter months can bring stronger winds and choppier surface conditions that occasionally cancel trips to the more exposed sites.