The elevator on the left of the dark area is an alcove that contains a stimpack. If you kill the monsters here, you can get ammunition from the fallen soldiers by pressing the left switch to get ammunition, and the right switch to reveal a secret containing green armor. The northern blue-floor room contains soldiers and imps. Under normal play, you won't be able to access the chainsaw if you leave it behind. When you first enter the map, turn around and head to the left to collect a chainsaw. However, you may be more interested in getting as much as possible from the map, as opposed to speeding through this level. Charge forward, head down the corridor, and reach the exit in the darkened room to complete the map.
This is a small map, starting with two soldiers facing away from out.