Quote Originally Posted by Turgenev View Post
To be honest, the maps came first and now I need to rationalize them. At this point I'm leaning towards the idea that the dungeons were flooded on purpose. Some of the later maps have rooms that have access to the water. I picture travel along the waterways are done via small boats/gondolas. Or perhaps the inhabitants are amphibian (semi-aquatic) in nature.
Oo... both ideas work.

Quote Originally Posted by Turgenev View Post
One idea I had was the complex was a Dwarven outpost first but an evil Aquatic race (Kua-Toa? Deep Ones?) slew the Dwarves and then used their own skills/magic/gods (or all three) to turn the streets into canals and flood the place. Perhaps the original inhabitants had mined their way into a flooded chamber that released the aquatic horrors on them.

Here's the rough draft for the junction chambers:
That could work as well.