More Future technology that is already here and will be seen in use soon: https://www.green4sea.com/worlds-most-eco-friendly-cruise-ship-designed-in-spain/
She will not be unmanned though. That wouldn’t be possible. How could you have cruise ship with no Captain to host the Captain’s Dinner?
Oh I remember, somebody suggested hiring an actor to do that duty.
(Maybe a certain ex-Captain with cruise ship experience would do too. He just have to get out of jail first)