This is a phenomenal perspective of both ancient archeology and geology. The cave experience is beyond words, as is the siting of hundreds of artifacts and remnants of Mayan civilization. There are 2-3 professional videos out there on the cave (e.g., NatGeo and THC) that will give you a flavor for this cave and the tour experience. Do NOT miss this experience if you are in Belize.
This tour is not for the faint-hearted, as described well below. Anybody who visits Belize must go on this tour, which is going to be pretty much the same experience regardless of the tour company.
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