Yea I have have heard only tid bits about Rock....sounds like a sweet place to dive deep...maybe 270ffw if my info. is accurate,,,,but being privately owned I can see it being diff. to arrange.
PS--is this a diff. location than the Rock Lake State Hatchery site?
Yep, Rock Lake is 285feet deep. It's soutwest of the Blue Hole about a mile or two on the Agua Negra Ranch (sp?) I've got the GPS coordinates. I'll pull em up later and you can take a peak at it on google maps.