I don't really see much difference between this and the most expensive/extreme tourist mountain climbing. Plenty of people die on adventures with things where t

I don't really see much difference between this and the most expensive/extreme tourist mountain climbing. Plenty of people die on adventures with things where they don't really understand much and put their trust in paid experienced guides. Its not unusual for a death to be caused by the expert guides being wrong and in the minority of opinion on the right way to do something or planners being wrong on how many tourists can be handled, which tourists are fit enough, etc. I think many more people who already survived a one time sub trip with that company will ultimately die in safer equipment due to cumulative risk, so one really has to factor in quality of life explanations to argue it is unacceptable, but then maybe from a quality of life POV a once in a lifetime trip was fine. The real issue I think is the pilot risk which wasn't approaching 100% only because there were other failures that could have shelved the sub besides catastrophic ones.