Maybe if there's enough folks that want to do it they would run a 3-tank trip out there without the blue hole. That's something people have sometimes suggested would be a nice idea from Ambergris but they don't seem to get enough interest to run such a thing.
Maybe there could be an organized add-on extension for some days to the interior afterwards...
That is a fabulous idea!! I would be 100% on board for that. I'v been caving on dry land in italy, So cal, Northern Cal, lava tubes ect. Blue hole for me would be at ow depths, we personally don't need to see the cave/stalactites but HMC sounds like my MUST DIVE site.