OW/AOWD/... It really depends by the dive op, let's say they use the certification to discriminate the experience, in the end they are interested in how comfortable you're in the water and about your overall experience. Whenever the cenotes are a very easy dive, due to the calm (and fresh) water, it's not like diving on a shallow reef, buoyancy and being able to handle an emergency is a so much important (in some passages you have the rock above your head for a fair distance.. you cannot just swim up in case of a problem).
I went with Dressel (Iberostar) for both Cenotes and Bull Shark, they were asking people to have the AOWD (at least) ...because probably they are used to more "holiday divers" and they won't risk to put a diver that only did 10 dives in the Carribean in a dangerous situation.
I'm frankly not sure why some of the cenotes there are classified as normal dives, while they are clearly something else (cave; even without going in the cave part, where there's one), maybe it's a matter of marketing and finding divers with the cave certification is too much (money wise): where I live, going in passage with tens meters overhead and pitch black (without torches) is cave, not OW.
I went with Dressel (Iberostar) for both Cenotes and Bull Shark, they were asking people to have the AOWD (at least) ...because probably they are used to more "holiday divers" and they won't risk to put a diver that only did 10 dives in the Carribean in a dangerous situation.
I'm frankly not sure why some of the cenotes there are classified as normal dives, while they are clearly something else (cave; even without going in the cave part, where there's one), maybe it's a matter of marketing and finding divers with the cave certification is too much (money wise): where I live, going in passage with tens meters overhead and pitch black (without torches) is cave, not OW.