I was reading through this thread and thinking about how best to formulate my comment about the (lack) of proper investigations of many dive accidents.
Then I came across this scientific paper which spills out exactly my thoughts:
'As a result, some have quit cave diving all together and those who did not quit do not wish to speak about it. So much so, that all of our continuous and persistent requests to speak about the accident to those that were present in the cave and cavern fell on deaf ears. This unfortunate (but understandable) situation results from the fact that the agencies associated with cave diving (e.g., NSS-CDS, the National Speological Society-Cave Diving section, and the NACD, the National Association of Cave Divers) are self-regulated, so that there is no means to force individuals to speak about this, or any other case. To put things in perspective, it is appropriate to point out here that there are other branches of society, such as the military and the police, which regularly encounter similar, if not more tragic, events and, yet, cannot choose to avoid speaking about the issues. These branches are, of course, not self-regulated but rather are regulated by the corresponding governing agencies. As a result, accidents are more rigorously investigated, no participant can avoid speaking about a case and, consequently, there is probably a much better understanding of accidents and how to avoid them.'
(Doron Nof and Nathan Paldor, 'The Cave Resonator and the Parker Turner Cave Collapse Problem' [2010] Safety Science 607. Available at
http://www.swiss-cave-diving.ch/PDF-dateien/Cave-Resonator-Collapse.pdf )
The question is: do we really want to be regulated by a governing agency?