Incredible.
A comfort is derived from knowing presumably beyond the shadow of a doubt that the five divers felt nothing. You excellent explanation helped immensely to fill in the knowledge gaps.
Let's hope that from this horrendous experience they will take greater measure to insure against such tragedies.
One news said that the pod they travelled down there in wasn't even fully certified! Something about a compisite hull which over time degenerates. I'd say that if true that certainly deserves somes serious investigation.