After setting the speed and gravity to the lowest value, start the game. Stand on the wheel in the middle so that one of the arms raises you up. When you are high enough so that you can start walking up the arm, walk up to the center of the wheel. You will notice a hole on the round wall in front of you. The hole has some black wires hanging around it. Crouch jump into this hole and continue jumping straight up. In a few jumps you should be able to squeeze between the wires and get on an invisible bridge. This makes an excellent sniping point.