Help me & my brother please.

If this is not what you meant send me a comment cause I think of two things you might mean. You start inside and after you kill all the guys make sure and wait a few cause some pop out. Go down the left hall and send the spider down the tunnel by the couch, kill of as many guys with one as you can so to make this easier. Go back to the door, to the right before the right hall is a rapel point and of coarse repel up it. You need now to get to the big room with the load of people that you look at when you start. Now you have to pull the first of two switches depending on level you might not need an order, climb a flight of stairs by the room and it has a hole which you fall down. The other switch you just walk into the room. If you are on 00 agent or I think agent too, You need to go in all the rooms you can after unlocking the first switch and you find a security thing. Switch it off and the other switch room opens. If you need guns and ammo theres a secret door in one of those rooms. Im sorry if I didnt explain it good. I will send you a more to the point answer soon.

Im sure you got it by now. But go to the walkthroughs man. Ive got all platniums and I still find something new every now and then. Also it might help listing what difficulty you play on. Cause operative is much different than agent and more so than 00agent.