I did my IANTD Cave course with Protec in Playa del Carmen in 2008 with Marcia as my final instructor and although Adam returned in 2009 to dive some more I couldn't make it. So, my return trip in 2010 was long over due. We were helped greatly with hotel and car bookings, equipment rental and guiding by Gabriel Gasca Rubi, commonly known as Marcia. He operates out of Playa as Advanced Diver Mexico and we thoroughly recommend him for cavern and cave guiding, ocean, cavern and cave training and just being a great general Mr Fixit.