WOW. Just spectacular. The water was clear and crisp and about 68 F. The cavern is one of the few (well, actually I only know of this one) that an open water diver is allowed to go in. It is very safe and fun. You will always have access to the surface from where you are, but at an angle, not just going up. I would really recommend this dive. It really opens your eyes up and shows you the difference between an open water dive and being underground with a ceiling above you.