Rummaged through this one after reading this...It's one of the few I never played 20 years ago...doesn't look like it would be too hard to update by just taking standard monsters and adding an aquatic template...after all, do you really need new stats for Tritons and Velyas when they're just swimming men and Vampires?
I'm currently trying to convert a few Companion and Masters set adventures for continuing Kingmaker(I think they'd fit) But maybe I'll try my hand at this one too.
Of course, since your post is almost two months old, you may not care anymore.
