The magnitude of the tragedy here is unimaginable. As this forum is “dive litigation,” though, it is probably worth pointing out that the allegations of fact in the complaint are allegations, and it will likely still be some time before we know which facts the defendants will dispute or whether there are other relevant facts. The governing law of the state may also have things to say about assumption of risk for inherently dangerous activities, the effectiveness of liability waivers, and contributory negligence. It could be a year or more before the case concludes, and if it settles, we might not know much more than we know now.
Again, since the purpose is to discuss litigation, I would just cautiously propose the following hypothetical for discussion with the caveat that this is no way is meant to represent the facts of the specific case -- I don't know anything other than having read the complaint. This also does not necessarily indicate my personal views. This is only a hypothetical presenting an imagined legally competent certified adult diver facing some decision points.
Hypothetical:
Legally competent adult OW certified diver has only 1 post-certification dive 2 years ago. Legally competent adult diver decides to do AOW class in cold, challenging conditions. Legally competent adult diver signs waiver releasing instructor\dive shop\certifying agency from liability for negligence. Legally competent adult diver buys own drysuit from private party. Legally competent adult diver makes conscious decision to dive drysuit without inflator hose. Legally competent adult diver makes conscious decision to dive without ditchable weight. After experiencing discomfort at 15 feet in drysuit without inflator hose, legally competent adult diver makes conscious decision to do second dive to 60 feet. Legally competent adult diver makes conscious decision to enter darkening water near sunset without dive light.
Even assuming alleged bad advice from instructors at multiple junctures, in this hypothetical, legally competent adult diver had many decision points that arguably could have given any certified diver pause, which would likely be emphasized by the defense if the hypothetical situation resulted in litigation. What risks did the legally competent adult diver knowingly accept? If the hypothetical instructors only committed simple negligence, is the liability waiver effective? Also, which portions of the AOW e-learning or book did the hypothetical legally competent adult diver complete, and what warnings would that learning have provided about such situations?
PADI standards may well inform what the applicable standard of care should be, but they are not law.