According to reliable sources, he had full Cave Diver certification.
For those who do not know what the cave is like, you start in an open pond and then proceed down a narrow hole into a HUGE room. The incident apparently happened in that huge room. The cave's famed challenges are located well after that, so the location was well within the training and experience limits of someone with that certification.
I will adamantly disagree. The requirements are not just full Cave. One must also have in excess of 100 cave dives (Abe Davis or Wakulla award) and be full tri-mix certified - according to the GIANT sign that now sits in the parking lot. So, unless one meets all the qualifications, they have no business being in any section of this system.