(I'm new to this fandom btw so I might get some things wrong) Ok so you know that for some reason there is measurements and pictures of dangerous levels and entities (i.e level !, the void, skin-stealers etc) and you wonder "now how did they manage to get that info?" well I have an idea that someone called The Cameraman. They're the one taking the pictures and making measurements in highly dangerous levels and somehow surviving. I can flesh out this idea some more but let me know what you think! =D