[SandyCaesar]

Um, auxiliary engines...backup auxiliary engines...tertiary backup auxiliary engines...somewhere...?

Okay, I've got it. As far as I can tell, the stern of the bottom level seems unflooded--after all, Silver was able to access it. Let's just say that one of the emergency diesel generators is located around there, is unflooded, and is often used as a handy storage for food.

In the future I will confine myself to exploring the spaces that are definitely unflooded, and will not venture into the Schrodinger engine rooms.