One observation: some of those staircases are too long to be in most of the above-ground buildings.
If someone hadn't drawn on CH 14, I might have been able to extract a recognizable image. :-(
Most of the viewpoints & view angles are definitely odd; maybe the cameras pan around. OTOH, maybe they are hidden, and WYSIWYG...
The gamma is terrible: like trying to work with out-of-focus TRI-X negatives that have been underexposed in contrasty lighting -- and heavily overdeveloped. (There's just "not much there there")...
Even so, a word of caution: expanding and enhancing CH16 is definitely NSFW -- or posting on FR...
Again, ThanQ!! I thought that evidence was gone forever!