SECRETS

1. In the dark passage that leads to the central hub with the bridges, shoot the wall on which the very low light is shining.
2. In the nukage room a secret area is in the low passage after the arachnotrons. It's on the right side of the passage.
3. In the warehouse area, reach the computer area overlooking the warehouse. To your right will be a recessed panel that has a different light texture on the wall. The switch behind the panel lowers a crate that contains a chainsaw.
4. To access the plasma rifle, go down the elevator to the room that looks into the area with the plasma rifle. To the right of the rifle, in the dimly lit area, is a switch. Shoot it to get a message about an aqueduct becoming accessible. Go back upstairs, and exit that computer room via the switch chamber. Go down the ramp, and jump into the pool of water just to the right of the small door.