Campaign Idea: Under the Black Sea of Blackmoor

[Havard]

In this thread, Freedom 92 made a comment that sparked a few ideas:

The Sea People is a nice thing for a aquatic campaign but other then that not sure how it would fit.

As many of you know PC 3: The Sea People is a classic D&D (BECMI) detailing aquatic races such as merrow (meremen/mermaids), aquatic elves, sea giants etc to be used as Player Characters. The booklet also details the Sunlit Sea region of the Known World / Mystara setting.

Now, how would replacing the Sunlit Sea with Dave Arneson's Black Sea change the nature of an underwater campaign?

For one thing we know that the Egg of Coot is spewing out monsters and all kinds of weird experiments into the sea, including Gargantous monsters known as Naliseth, Aquatic Dinosaurs and others making this perhaps a much more sinister campaign than the setting detailed in PC3 (although that one too has its darker spots).

Also, we know from DA4 that the Merefolk are currently (NC 1025-)at war with the Skandaharians because the northmen enjoy killing the dolphin friends of the Merefolk.

Comments? I will post more thoughts later.

-Havard