I would like to see some info on what size tanks they had, what was in the tanks, condition of the line @233', and maybe a depth/time graph from their computers. I think you could really piece together the details with that info.
I think a reasonable narrative for what happened to these two could serve as a great lesson for why people need specialized training (from a professional) before cave diving.
The old saying "You don't know what you don't know" is really in play here. People who are reading this thread who do not have such training are left with a knowledge that people are saying the two did not have proper training without a good sense of why that matters. They have no idea how many very specific things were terribly wrong with this dive when viewed by people who do have this training.