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“The tour is a great mixture of walking/swimming through a river inside the cave - the temperature is very comfortable - , a small climb inside the cave and a tour of Mayan artifacts and human remains.”
“He was very knowledgeable and encouraging as we forded the river (3 times in and 3 times back), swam through the cave entrance (and a few other areas, depending on your height), and climbed through and up many rocks.”