Wookie
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Kudos for the reflection in your right eye.Mine in red below.
I understand that with the diving you and @Wookie are doing, you may have to be 20-30 pounds negative (although it still sounds crazy but I get it) and I also understand the need for negative entry. This is not what I am questioning. 5-6 lbs of negative buoyancy and I drop like a rock. Why would you ever need to be 25-30 lbs negative for the entry???
You don't need to be, you sometimes just are. Depending on your gear, say DPV, double steels or a CCR, a stage bottle or two/three, a camera rig or two, etc.) sometime you just are heavy, by a considerable degree. But did I miss something, where does it say he was that 25-30lb's negative?
I know you can not help your rig being too dense (or can you?),
You can trim down what you carry up to a point, but still you will / may be negative, and maybe be quite a bit. Also why a lot of folks like to dive with ally cylinders, which was the exact reason I didn't (too light).
but I would think you would want to have your BCD inflated to some degree to still keep you negative but not 25 lbs negative. And even if one was not trained to test your BC inflator prior to entry (I would think technical diver would just like recreational divers), then you still would catch it that your valves are not open as you try to make yourself less negative prior to jumping in.
Trained to do so doesn’t always equate to actually doing so, unfortunately.
I also understand that it is a Swiss cheese for many accidents - check your valve open, test your air prior to jumping, test your BC open, do your valve drills , have your buddy check you if you are not solo etc… And any one intervention may have averted the accident. I just have a hard time wrapping my head around how this happened and wondering if something else was at play.
Methinks you are just over-analysing it. On the surface of it (no pun intended) and until / if we learn more, given the 'circumstances' it looks relatively straight forward after the fact - i.e. after going in - to me (the accident that is).