I read "The Under" and immediately thought of all the stuff that I call "Subterpunk;" just a contraction of subterranean and Steampunk.
Since steam isn't all there is to Steampunk, and I didn't include it in the term, it's just based around the plot ideas of Steampunk and not the inventions. I categorize Tunnels and a few other good ones as Subterpunk.
Just ranting and raving here
Anyway, that map has promise of all kinds of stories, so I like it.