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This forms the platform we need to escape.

Use the beam to blow up the turrets guarding the exit, and then power up the receiver. If all goes well, you’ll knock the cube down onto the starting area, and land there yourself. You should be able to do it if you aim at the highest point on the wall next to it.

You need to slingshot yourself into it, using the same trick. The third redirection cube is on a high and very small platform across from the exit. Use this to sling shot over to the one lit siren, and direct the beam over to the second siren by the starting point. You can let go of it at the height of your jump, so that you can shoot a new portal, and still grab it before you go through the portal. To carry a cube, you’ll need to begin the spring process again while carrying the cube. Start by grabbing the next redirection cube. You need to swap it out so that instead of falling onto the spring again, you “fall” into the original portal and out of a launch spot. You can then shoot another portal onto one of the various white walls to be flung to the spot you need to go. Start in front of the portal, and start the cycle of hitting the spring and being throw into the air. The only way to fling yourself around is to put one portal above the spring and drop down onto it, with another one nearby to throw you straight up into the air. Go up and redirect it into the first siren.

The first step is to just redirect the beam, so grab the one redirection cube on the floor and put a portal above the spot where the laser hits. Put a new portal above the light bridge, and then another onto the other side of the wall shielding the laser. Just thread the needle by putting the beam through the rest of the sirens and into the receiver. Wait until you’re healed, and then run out and direct the beam into the turret to kill it. Spring back over and grab the other one, and make it to the light bridge. Use it to redirect the beam into the two sirens. Make sure that both blocks land on that side, and then go back through a portal. Put one portal above the light bridge and create a new vertical bridge to block the first one by the spring.

Pushing the button drops two redirection cubes, but they’ll hit each other in mid air. Start by using a portal to get across to the other side of the room with the button. Use the stuff around the room for shielding and keep moving. Note that the turret can shoot through the grate, so be very careful. After the surprise, drop down into the main chamber.