The Grotto is the most common "cave" up here... It is really just a big hole and doesn't really require any special training. The most notorious cave is Leap Frog, first explored by Kim Martin and Terry German... it has been sealed since it was an insanely dangerous dive.
There are others like Spider Hole, but these are well beyond "cavern" certification...
A couple of old flics for you...
Leopard Frog:
Spider Hole:
(This was put together by my friend Carlos Fonseca who died diving in Ginnie a few years ago.
The Grotto: One of my shots that appeared in DIVER Mag a couple of years ago.
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