Not only is the last post to this thread "dead", so is the whole concept of Public Saving Diving, as far as any "Rescue" element may be involved. Just look at the number of "training exercise" LODD incident's. There is no "rescue" in Dive Rescue.
The hard facts are that any technical skill takes longer to learn and must be practiced with greater regularity to maintain competency. Conducting any activiety in a hazardous environment requires frequent use of learned technical skills. Simple skills (riding a bicycle) are quickly learned and maintained for long periods of time. Police, Fire and other emergency professional don't have the opportunity to use the specialized skills they need to employ underwater, with sufficient regularity to maintain the performance levels needed to operate safety. On the other hand having a specialized unit devoted ONLY to hazardous diving, as the police in the United Kingdom have, reduces death, injury and incidents involving equipment malfunction's due to repeated utilization of the equipment and technical skill sets. Having "line personnel" even think they are qualified because they have a piece of paper or plastic (certification) is, at the least, grand folly and at the most flat out gross irresponsiblity. There certainly are numerous persons and entities who would like to have you think that "certification" is the same as "qualification", don't fall for that.
The use of specialized equipment and knowledge of how and when to use it is essential, but proper and up-to-date skill sets are far more essential. Knowing what NOT to do is more important than knowing what to do. Intutative reactions will kill.
Tell me please what is so important down there that any of you would lose your life and risk your family's well being for? What is it that can't be accomplished quicker and safer with surface techniques and surface equipment? Think, how often you have seen or heard of using "Public safety divers" during flooding conditions? Too many elected and appointed public officials incorrectly equate "divers" with "aquatic incidents", (the old one-size-fits-all thought process) in spite of the conditions NOT being a "diving operation". So few people even know how long the "average" person will survive sub-surface. The response time for most agency's is three (3) or four (4) times the survival period for most drowning deaths. Just look at the medical data.
Wake up, think this through, before your name is listed on the ScubaBoard "Passings" or other LODD list.