You never really like it when the ghosts of old heirs visit you. It makes you think too much about how awful it is that if Feferi isn't very clever and very lucky one day she'll be joining them, and then you need to sit down for awhile and try not to think about it.

But this visit went much better than usual! The dead girl told you all about ruins hidden under the sea, just ripe for exploring by a plucky young up-and-coming archeologist!

The only problem is, how can a landweller make it down to them?

Aradia: Contact a friendly seadweller for advice