Well first of all, the ATM cave tour does not mean an Automatic Teller Machine in a cave :). ATM in this case means the Actun Tunichil Muknal Cave, it is a place that hosted Mayan ceremonies and has many superstitions associated with it. There are human remains, pottery, carvings and so much to see.
(Click image to enlarge.)
However, you must be prepared to get wet because the only way in is to swim! The entrance of the cave is beautiful and the water is crystal clear. The way is wet and rocky into what the Mayans refer to as the underworld.
Here is a video captured by the Trans Americas Journey:
Click here to see pictures and a detailed description. Thank you for a wonderful article Karen & Eric