Hi, I tried your map, and I noticed that the doors to the lift are intentionally hidden, right? I really like the tunnels themselves, and the sounds for the lift are nice – very realistic.
I found one thing that might be a question, or maybe it's a problem with the editor. I noticed that when I try to align textures in 'surface properties,' it keeps changing the scale back to default every time. Is this a bug in the editor?