Once again you are making the presumption that they are looking for a financial settlement. I doubt that's an outcome they'd be looking for, they'd be far more interested in breaking anyone associated with this mess.
Breaking? In what way? Who exactly? The CEO went down with the ship. The company will close, it's staff will be unemployed.
I can't see this going very far. No-one forced them into the submersible and even without a waiver, you'd be a complete idiot to think that getting to a depth of 3800m was not without *significant* risks of death or injury.
Even if I had paid, been promised it was safe, been shown all sorts of certification, I'd have gotten to within 1m of that thing and bailed.