to be fair, the ferry would usually also require more hands to operate it but it kind of magick'ed itself.
i imagine something like a destroyer could be handwaved with having autoloaders and stuff, and mainly needing people to operate the guns and steer.
This is the lockpicking lawyer, and what I have for you today...
...and since it's a cylinder lock, I'll use this tool that Bosnian Bill and I made. Click out of one, two is binding...