I tried for the first the wall builder addon, if you don't have it, you have to download this build of blender:
http://graphicall.org/170 , it's the freestyle build too.
Now back to the blend, for some reason when i go into camera view mode, i can't see anything beyond the point where its completely black but the hallway is really long! ( with about 70 segments, and curved ). Rendered with Cycles at 400 passes or so.
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yes. you would able to see a third character inside the tunnel because i wanted to do that first but i tried to texture the walls which is seemingly impossible to do because each brick is separated from another so it takes A LOT OF WORK to choose the seams, but so far i have the floor textured. When i finish the blend i will upload it, now i can't because i am in france right now so i don't have my computer and can'y continue to work on it, thank for the very nice comment by the way! - english version of my above comment.
the camera has a "clipping" setting -- increase it as needed to see the end of the hall