lizardland
Registered
I don't disagree. My point is that one single factor isn't necessarily creating a negative outcome. It's a compounding of many factors. You can teach in low visibility if you are willing to make adaptations. Those adaptations are usually costly in some way (1:1 student ratio, added supervisory personnel, going to a less convenient site that doesn't have the potential to lose a student in, going further afield to find better vis, taking more time/more dives with students, etc). Low visibility is not the problem, not adapting to low visibility is the problem. At the end of the day, some sort of risk assessment has to inform how the diving is done and whether anyone gets in the water. Too often what actually happens is that the decision making is done based on "I need to get this finished so I get paid" or "I know what I'm doing, I'm an instructor" or "I don't want to let down this student" or "the divemaster can look after everyone I can't see".In my opinion visibility low enough that you can't see every student makes it advanced conditions beyond the scope of basic scuba. I know the instructor had to make a living and probably had other factors motivating them to do the course but stretching the bounds of safety is not wise.
We have had fatalities in classes here in Puget Sound that were in part due to very low visibility. I don't think it's too much to ask to learn from other people's mistakes instead of repeating them and hoping for a better outcome.
I had a career operating a fairly large high voltage power system for a local utility. In order to hopefully eliminate accidents and fatalities our crew had the pleasure of multiple human error prevention classes. I guess I'm a bit picky about normalization of deviance.
I take your point about normalisation of deviance (I also work in a job where things go bang) but equally for a big part of the world low vis is the normal. If we start making a wide-ranging ban on low vis training then everyone is going to end up training in an environment that is the polar opposite to what their local conditions are. That just seems perverse to me and as much of a failing as ploughing ahead with no thought to conditions would be.