Not surprising to those of us who have looked into different fatalities involving shops or operations. Information in some of these cases is as scarce as hen's teeth. Some of it is due to liablility and legal issues. Another part that should not be is PR. Having someone die on your site, boat, resort, etc is not good for business.
I'm not surprised about not getting official information. I'm surprised that we haven't gotten the leaks of information that we usually do with at least the basics of the accident if not a little more.
Taking OW divers into any kind of overhead, into cold water for the first time, not enforcing proper buddy procedures, beyond recommended depths, etc. Practices that are allowed to take place and a blind eye turned to by the agencies that sometimes result in dead divers seem to have an acceptable level of occurrence since no action is taken and no public light shone on them.
Apparently the fatality took place on Trail #1 and our max depth was 50 feet and the viz was 75 feet on that trail. The mine is well lit and you don't really need lights. However, we all had a primary and backup light in our group. I have read that they're not allowed to take lights on the first dive (Trail #1), but I'm pretty sure we took our lights on all the trails.
The surface temp was 57F and the bottom temp was 50F. The mine itself was about 58F, cool and clammy.
There was no real overhead on any of the beginner trails we did: #1, 2, 3, 4, and 7. There were a couple of tiny swim-throughs that we were told in advance we could go through or around, but I don't believe trail #1 had any kind of swimthrough.
We all assigned ourselves into buddy teams, but I can't say that they were followed religiously, although there were no issues or separations.
If you don;t want to be responsible for enforcing good buddy procedures fine. Just don't insist that divers follow your every move. Make sure they know that they are on their own. Make sure that they have a plan before they hit the water independent of your own so that if something does happen they know how to deal with it.
Jim, I'm sure that you know that this certainly couldn't happen at Bonne Terre Mine unless the divers know how to follow a permanent guideline and can lead themselves in and out of each trail and plan and manage their gas supply appropriately i.e.) minimum cavern certification. The difference between the mine and a cavern environment is that if one did get lost, you could just surface anywhere. The viz is fabulous and you should be able to see your group/leaders, but if not, you could just wait to be rescued on the surface rather than "exploring" openings or other trails.