No lights in dark Kennels passage

[Linux.Blue]

Spoiler below!

From the light switch area; look down that long hallway (where you hear something and get killed). Be sure the lights are "on". Go way down to the other end of the hallway and to the left. There are three boxes. Use those boxes to cover up the three openings on the wall, near the floor.
Now, turn the lights off, go down the hallway, to the right, over to the other side. something else will happen