Blanco Industries (map name: pv_b)

so smash and crawl into the first vent you see, jump onto a pipe, walk right, smash your way through two more vents until you find one on the floor that you can smash and drop down through. You'll land behind the locked gate. There's another cache of goods on this level: from the starting point, run down the stairs and keep left, pass the covered doorway and come to an alcove where there are three large medkits. There you'll see a crack in the wall. Break it and crouch to enter the secret area that has three crates containing armor. Hopefully, Nikki won't have torched you by now! Take the fuses to the pump and just walk up to each fuse panel on either side to start the pump and drain the acid from the first pool of acid (under the pipe you walked along).

Go back to the first pool of acid and jump (or climb) down where the acid was and get the bridge key from the corpse (cheat to get this item is: give bridge_key). Open the gate by the second pool of acid using the bridge key, activate the switch inside and walk across the new bridge to the other side of the acid. Activate the tiny red switch to lower the elevator (be prepared to wax the thug on it), ride up and again be prepared for enemies when you reach the top. Climb up the stairs and enter the door. Activate the switch on the wall by the next pool of acid to start the "smasher things" moving. Walk across carefully by riding one to the other and then jump off the other side. There's two ways to go from here -- through the door on the left to a cache of goodies and back where you came, or right, past the pipes and through a door to the next area. Blow up the barrels -- they make nice explosions for easy killing of nearby bastards! Round the corner, climb the ladder, walk along the catwalk, through the door, then another door outside, climb the stairs by the vats, through a door, down the hall, down the stairs, and up to a door and on to the next level (after a brief in-level cut scene of Nikki running away)!