Eggs.

This has all the makings of a film scenario: maverick inventor who defies the rules, in his own submarine, visiting the Titanic, with a limited crew with personal involvement, visiting the Titanic. Then they go missing and there’s a very clear countdown timer by when they need to be rescued or it’s certainly too late. Of course it appeals to the public.

The sharks in Hollywood are already ripping each other to shreds for who gets the film rights.