Well, I finally dragged (pushed, shoved, kicked) my Olympus E3 and 7~14mm lens underground. I am going through somewhat of a re-education with digital dSLR imagery, so it was sort of rough going.
I was pleased with most of the compositions. I decided to plan ahead and (in my head) select just a few section of the cave to concentrate on (to make study of, so to speak) rather than try to image the whole hole. So, with specific areas in mind, I was able to set up pretty quick.
With the help of a few fellow cavers, and two Firefly slaves, we got some fairly descent results. Actually, it was a miracle any of them turned out! I shot all the images in RAW+JPEG, but inadvertently set the camera to automatically adjust the gradation. This resulted in very "blown" shadows and a correspondingly horrible amount of noise. This setting made the LCD previews look beautiful, when in fact they were artificially bright. My RAW files were terribly underexposed. I was able to run some noise algorithms on the JPEGS and salvage these few samples. Live and learn.
All were shot at 7mm (14mm @35mm film equivalent). I really love this lens!
http://www.pbase.com/darklightimagery/raymond_crystal_cave