mjnansen:
I think this is the Hole in the Wall right by Half Moon Bay- before you get to Fish Den, only about 5-10 min by boat. It's a nice dive, but really more of a swim-thru crack (like Mary's Place). To call it a cavern is really a stretch!
The one that I know is waaaay East, just offshore and South of Old Port Royal.
It is a tunnel that is maybe the width and height of a Toyota Camry at 85 feet, then as it slowly angles up, it exits into the daylight constricted to the dimensions of a kitchen stove (which was probably a Yugo in a previuous life just to keep the car analogy going because very few know what an MG Midget would be). It's not a difficult thing but does produce claustraphobia and a very unique experience if you happen to be the last man through following a herd of turtles.
In exploration (being dragged behind a motorboat on a dive plane for endless miles, dropping weighted float markers when we saw something cool), I have been in dozens of cracks, slits, holes, chutes, chumneys, slots, chasms and sinks all over the Bay Islands, but after diving the caves of Florida, Missouri, Iowa and other countries in the 70's, I ain't seen no caves in the Bay Islands. That doesn't mean that there isn't one out there, waiting for a shore diver to stumble over it for the first time. That will be fun.
In island culture, there are many places with the same names, even on the same island. Roatan doesn't have even one Georgetown, but it does have two Sandy Bays. The well known one is on the North side and is the setting for an enclave of Norteamericano homes. The other on the South side and is where CoCoView sits.
Why there is Port Royal and Old Port Royal, I do not know. They have not only the same Area Code (45) for the phone system, the same Postal Zip Code (4), and the highway that bisects them both is called Port Royal Way yet the two roads really don't connect but for the cloverleaf.
The airports have different names. They, too, may have shore dives.