There were reports that it was communicated to the mothership that the submersible was heavy and attempting to ascend shirtly before an acoustic event detected moments later followed by no further contact.
If that reporting is accurate, they likely suspected something was very wrong.
The eight hours that passed before ant notification was made is very telling to my mind.
What went on during that eight hours.
Where did you see that? This makes it more interesting. Yes, why the 8 hour wait unless they thought it would reappear at the top?
I haven't heard that yet. It might be a couple of years until the coast guard issues a report.