It was advertised as a perpetual mobile machine, but as we found out that was a lie. It was originally just a luxury train cruise, but then the freezing started so they repurposed it to be a self sustaining life raft. But once again, nothing lasts forever.
It seems like the biggest issue with the movie you might have is lack of detail, you can read the source material. It’s not that ridiculous that eccentric billionaire converts their over engineered luxery cruise line to survive the apocalypse.











Sounds like you need a new cat guy.