Where were you diving at in MX. I just came from down there (spent four months in Playa del Carmen) I have a great many cave Instructor buddies and Cave guide buddies down there. I did some cavern dives down there in Eden and a couple other spots. Glad you had fun!
The cavern dives are spectacular! I am staying in Tulum now but just spent a week in Puerto Aventuras. Diving with Zero Gravity which is the local GUE shop.