A concept of the slime tunnel that appears in Ghostbusters 2 intended to be a multiplayer level in Ghostbusters The Video Game. It of course didn't make it into the game.
I had a lot of fun coming up with this one. Well, at least coming up with ideas of how the rest of the area looked like. In the movie, you mostly only see what's seen at the end of the train platform at the far end of the concept. I did a lot of research as to what the pneumatic subway could have looked like and what it's history was. Turns out, the station never actually existed, and was simply fiction in the movie. What was actually seen in the movie was based on an actual location, and that's what I drew a lot of inspiration and research from.