Carlos is definitely the right ATM guide to choose. He is personable, funny, and passionate. He keeps small groups and he cares deeply about the preservation of the cave. Some other groups were almost 15 people. In the cave it is tough to hear so I can't imagine the last 10 people in a group of 15 could hear anything... He clearly loves what he does and he is great at it. We booked through our hotel and his van came and picked us up. ATM is also a very cool place and a must do on your trip.
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