(Where are Chamber 2 and 3?)
Chamber four: the first introduction with the button for the multi-power switch.
Wait, i have an idea. At first, the chamber looks nice and simple. Mia have to send the Borealis to Transport. She has to push a button (box button? or make some other, like a switch or so), but when she does it:
GLaDOS: "Oops, I forgot to tell you that. The pipes are not properly grounded. So the floor where the pipes for electricity goes are... deadly. I'm sorry."
Hans:"I need time to fixxxxxxx (Bzzzz... hitting a pipe of electricity, but doesn't die, his hairs are getting high up, punk hair!)I'm sorry. I need time to ground those pipes! I make sure if you enter the next chamber, the pipes are properly grounded!"
Mia: "*Sigh*"
You have to get to the open door, but without your friend the portal gun it won't work. The button/switch also activated the 2nd portal gun holder, so you get the orange gun with you. You can use it to get to the door.
And, nice idea?