
Past the vent from #06, you will wind up in a room with multiple chaingunners.Enter the vent to continue to the next area. From #05, gently head down the steps and drop as slowly as possible, to land on a small ledge with caution stripes.Press it to lower it and continue, grabbing the shotgun shells and radiation suit along the way. At the outside hall where the shotgun guys are (past #04), one of the silver lift walls on the south side is misaligned.However, it closes thirty seconds after the level starts, so you must quickly get the previous three secrets to get through this one. Quickly head north, east, north, west all the way, south, west, north, and west through this passage before it rises.

In the blue passage from #02, enter the small passage turning east, south, west, south, east towards an exit.From #01, go up the first lift, then up the next one, but hug the south wall to reach a blue passage.Go directly behind your starting point.Making it all the way to the end will net you lots of supplies. The combat in this map scales with each secret you find, and you will fight specific monster groupings with each successive secret. A number in every secret shows you just how far you have got. While you can leave through any exit at any time, the screen at the start tells you how far can you go in the map, so you will need to do some secret hunting if you want to get through every part of this level.

There are multiple exits in this map, and the majority of this map is in the thirty-two secrets. Sector, thing, and linedef numbers in boldface are secrets which count toward the end-of-level tally. Letters in italics refer to marked spots on the map.
