Head forward and drop through the hole in the ground. Eventually you'll come to a ledge. Line Launch south and at the second gap, you want to shoot at 90 degrees to the left. Put explosives on the ground to blow a hole in the ground. Drop down in there and meet the intern in the next room. She'll tell you about all the guards (that you're probably already aware of) in the open room beyond.
This stalker area is rather brutal. If you can deactivate a couple of weapons, use it on the two snipers on either end. The prime striking points are the gargoyles in the inner ring. Use them offensively but once you've taken someone out, head back to the outer ring of gargoyles and usually you'll be fine. Do be aware that the enemies have thermal goggles. Just be patient and stay on the outer ring and you should be fine. But don't forget you can still use some of these Gargoyles offensively too. Decode the elevator when the room is clear. Be aware that it might have multiple answers but only one of them is correct.
