I don't know the cave's name, but I was taken there by a guide. All I have to say is that it is *very* difficult. There was almost vertical climbing (that was very difficult for someone that's 5'1") in extremely slippery conditions. I enjoy challenges, but this one was even a bit much for me. I was told the cave was 18 miles long, and we saw a rather large lake inside. This is a great caving location for someone who knows what they're doing, but for us novices, kind of difficult.
From journal Rainforests and Ruins in Belize