File:DM3 Sketch.jpg

‘''My original sketch of DM3: The Abandoned Base. Several aspects changed as I built and iterated the design as I played it, but most of it is similar.''’ — John Romero. Source: http://romero.smugmug.com/Video-Games/Quake/11299110_sftJNZ#!i=792937130&k=4Zt97DZ