Cavern diving certification is still a multi day course, open water certification does not prepare you for it. The 130 ft PADI guideline (AOW cert) applies to open water wreck diving and is quickly broken at most sites I’ve seen. Dos Ojos is particularly sketchy. On overcast days it can be impossible to see an exit at several points even when not silted out. Your guides will usually be side mount with two tanks, backup lights, and a safety spool. That redundancy isn’t for you, it’s because they are trained not to take the same risks you are. Caves are pretty awesome though.