Hello DandyDon,
I am looking into this event and others in order to learn and avoid others' mistakes. I am a pilot and I am used to study incident investigations and I find unfortunate that most of the times there is no organisation investigating these diving events thoroughly and looking into prevention and not prosecution/liability compensation. Sometimes national bodies do a good job in investigating/reporting these events. Unfortunately, in case of Italy there is no such body (as far as I know) for non-work-related diving .
There is pretty much no such body doing it anywhere that I know of.
There was a group in Australia a while ago, and a group out of the United States that did it for a decade or so before relinquishing the duties to DAN. DAN America did it for North America for a number of years, but they have not released a report for a number of years.
I wonder if one reason could be related to to the publicly stated reason that another investigative group, the IUCRR, stopped releasing reports. The IUCRR is a Florida, USA, group that trains divers for body recovery and accident analysis for cave diving. In the past, after they would complete a recovery, investigation, and analysis, they published a report. Visit their web site and you can see those archived reports. You will also see that there have been no such publications for years. They still do the body recoveries. They still do the investigation and analysis. They still write the reports. They will not publish them, though. The reports are submitted privately to the local police, and if you want a copy, you have to file a request through the Freedom of Information Act. This change in policy came under advice of attorneys, who said that saying the wrong thing in a published report, such as disclosing some private medical issue, could result in a lawsuit from the family of the deceased.