The victory lift is malfunctioning. A panel will open. Go inside.
You will find an clean chamber. Stand on the lift.
Place portals on the laser emitter and catcher
Lift will rise. Go to chamberlock.
Video walkthrough
Related achievements
Undiscouraged Complete the first Thermal Discouragement Beam test
Easter Eggs
There is a secret panel that opens but if you are fast enough you can get in by placing a portal. If you get trapped, quote by announcer "You successfully trapped yourself. An escape panel is now open". Once you walk outside, the panel will close. If you trap yourself again, annoucner will not say anything and once you get outside again, portals will fizzle.
