The possibility that was haunting me was that the Titan might have surfaced but couldn’t communicate its location, so the passengers were just bobbing along, trapped and running out of oxygen, while searchers simply didn’t find them in time.

I guess the other nightmare would’ve been if the Titan got caught on something deep underwater and couldn’t surface or communicate even though the submersible was intact.

As it was, I assume/hope they didn’t know what was about to happen and didn’t suffer.