A Playa del Carmen centre specialising in cave and technical diving — the training and the guiding for the part of the Yucatán's flooded system that lies beyond the daylight zone.
The peninsula holds the largest underwater cave systems in the world; Sac Actun alone runs to some 370 kilometres and is still being surveyed. Full cave certification is a serious undertaking, taken in stages, and no reputable operator here will take an uncertified diver past the cavern line. They also run ordinary reef and cenote dives.