listen to what alura is saying. she will tell you where she is. all the corridors are labeld(A3...) so all you have to do is find the right hall. when you first get through the vent, go to the left, and wait behind the second vent. use your crossbow and wait until the guard comes around to shoot him. next go through the door and kill the other guard. once you disable both the cameras, go to the right, NOT dtraight. you wilmeet a couple more guards. kill them adn keep going. you can go around the barrels and find the secret door, that will help. just follow the corridors alura tells you and you will be at the control centre where kiko is. you have to disable the security system and you win. the only problem is, i can't figure out how to disable the security system without getting killed, ds o you'll have to figure it out on your own.