Years and years ago, back in 2009 or so, I released this godawful thing called "BMRF Sublevels" as my first deathmatch map. It was a bunch of long straight hallways and used the same three textures everywhere. It was utter garbage.
I decided to revisit the idea. This is the result -- a "reimagining" of BMRF Sublevels. I had ended up deleting a TON of really neat areas from the original Sublevels to try and make it not run like a slideshow, because I didn't know what the hell I was doing.
This new map, Subterrane, is a lot closer to my original idea for Sublevels than what had actually happened.