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.
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