A One-Round Living Greyhawk Principality of Ulek Regional Adventure
From the introduction:
The depths of the Azure Sea hold many mysteries: ancient shipwrecks, alien civilizations, singing fish?
A Principality of Ulek regional adventure for APLs 2-10, and Part 2 of Short Stories and Tall Tales.
Note: This adventure will be of particular interest to aquatic adventurers and halflings.