I jumped off the map in the test area(go to basement computer room and hit "D" then leave, reenter and jump into the computer screen) and it yielded a void, no killbox or anything. There was a button that could be pressed at the highest point of the level, but not sure what it does yet.
I have complete the game, and the unique zone that is a lever in a black void is on the 2nd floor. Are the image is in the 2nd floor? The test area don't have a killbox in the bottom, so you can go down hours, i dont remember if there's a floor in there.
