The whole thing has "Red October" vibes... a sub goes missing and is assumed destroyed because of an underwater explosion. But the captain switched sides and hands the sub over to the good guys in secret.

What if the billionaires on board wanted to take a deal and help bring down the cabal? Wouldn't being dead make it less likely their loved ones would end up getting hurt in retaliation?

I think all the 17s and Titanic references suggest this is a psy-op by Q team as they prepare to take the world to the final precipice.