As a diver, who went into such an environment untrained & nearly became a fatality statistic, I would very highly recommend proper training before one engages in such activities. I was foolish in my first cave dive. Yet,... as the others have pointed out, it boils down to personal responsibility. There was no one to try stop me & no one did. I knew better, yet the curiosity got the better of me,... Not that it is any excuse. After getting a very good scare (almost ran out of gas) & well- deserved butt chewing from my instructor (also a cave instructor), I was made to realize just how foolish I was. When I went through my cave training, I learned, hands on, why it was so foolish. The "You don't know what you don't know" in real life. There is a fine line between regulation, personal responsibility & land owner liability. Every time there is a fatality in a cave system, it draws the noose tighter, of the land owner not allowing cave diving. That is what the main cave diving related groups/ organizations combat. Education is the key. Educate the divers, educate the land owners & educate the public, in general. A vast number of cave fatalities are untrained divers. Of the trained divers, next, are the fatalities in which the basic rules & or dive protocols all cave divers are taught are ignored or not properly utilized (diver error). Medical & natural caused fatalities are very rare, but does happen from time to time. It is all too easy to dismiss the risks of going into an overhead environment for the excitement or the adventure. Once again, as one who almost did not make it out,.... Think before you enter.