I've been following it rather intently, having worked many years with enormous amounts of pressure. From what I gather, around 6000 psi at that depth, slightly under that actually, at a bit over 5800 psi. And without getting morbid Wood, I actually took the time to read a couple of studies regarding that type of death. Obviously, and thankfully, it was instantaneous. But remarkably, according to one of those studies, though anything inside their bodies containing air or gas was instantly crushed, their bodies remained intact, unless damaged due to the trauma of the material with which the sub was made. The part of the study that I found most fascinating is that with that immense pressure (anything subjected to pressure heats up) , there was a millisecond in which the air was actually superheated by the enormous pressure change.
So thankfully, they never felt a thing, and their bodies may very well remain intact in a watery grave. Probably more than you may have wanted to know.
And it may be just me, but when I see something like this happen, my first thought is........well, you wanted to climb Mt. Everest, you knew there was a risk, and that was part of the appeal to your adventurous side. I do feel sorry for their loved ones, but they knew, or should have known what could happen.
West