The entrance to this cenote is about 100 m south of Puerto Aventuras. There are two water entries to Chac-Mool, both leading into the same rooms.  The first room is relatively large with much light entering from the opening. In the second room, a portion of the ceiling has collapsed  under an air dome  where divers can surface thus allowing  divers to admire two levels of beautiful stalactites. Along the opening of the main entrance, trunks and branches reach into the water. It is here where on sunny days a stunning laser light show takes place.  CENOTE Chac-Mool is one of the caverns which has a halocline.  This is where salt and fresh water come together creating fascinating visual effects. With its large rooms and maximum depth of 12 m, Chac-Mool is perfect for any novice  cavern diver.  It also offers long penetrations for cave divers and is home to the largest underwater stalactite in the world.