I have a huge issue with this statement in the article: "He says Ms Dai's weight belt was "too heavy" and her air regulator was faulty."
I'd like definitions... How heavy is too heavy? When I take DSD's out, I make an experienced guess at how much weight they will need. I am usually pretty darned close, and carry extra weight with me in case I'm wrong. Everyone ends up overweighted at the beginning of the dive (full tank) and hopefully closer to neutral at the end. Very generic statements like this, IMO, are absolutely ridiculous, and would be easy for a prosecutor to leverage against the defendant in front of the jury. Regulator faulty? What kind of fault? By definition, a regulator with a tiny hole in the diaphragm is faulty and will breathe wet, yet the instructor may never ever know there was a fault (and a student may never know it was even wrong to start). Where we (as instructors) get screwed is in the way prosecutors like to word things and place blame on us, where there may be no blame at all anyways.
I don't think I'll ever dive Australia, nor would I ever want to teach there if things are this harsh (especially when you take into account the liability they put on divemasters when leading certified divers). At any rate, something I have witnessed (though wasn't the instructor), was a co-instructor leading a single discover scuba student. Student did all of the skills with ease, then went on to do the dive. Our dive is a gradual slope from 5' to 40' (it goes much deeper, but not where we take the students and there is always sand underneath them). At any rate, instructor and student are 10 minutes into the dive, no problems thus far with the student. In 25' of water, student starts panicking and starts swimming towards the surface. As an instructor, we want to slow the ascent, ensure they aren't holding their breath, etc. Problem is, what happened to my co-worker was that even with dumping all the air and controlling the ascent, the student still could have held their breath for a small time. What happens if that would have happened? Wasn't the instructors fault - the student was given all the right info and the instructor took care of them as best as possible.
Add in an overzealous family or prosecutor, and they can twist that into them having 1 lb too much weight which caused their death... It will be interesting to see how it turns out and specifics, if available as well...