Your favourite D&D aquatic adventure

[Delazar]

PCs in our Spelljammer campaign are about to visit the planet Karpri in Realmsphere (basically a water-world).

Let's assume I have access to all scenarios ever published for D&D (any edition, including Dungeon magazines). Which aquatic adventure did you enjoy the most?

Edition is not important, I'm just looking for maps/plot, then I'll convert to 5e.

cheers!