Wow yes. you heard it Black Water Diving, nothing to be scared, at first I had the idea they take us to the channel between Playa del Carmen and Cozumel and we drift at 100 ft deep. but soon I realized the dive is hold at 30 ft depth and we descend just a few feet, there is a lap as visual reference, but as being so shallow, there is no even worry of decompression sickness,  and the reward could be incredible if you find a sea scorpion or any other rare creature.