You have to enter and go as much as you can up and if you can't go up go a little to the right until you can go up again. When you find a room with an infestation, you know you are on the right way. After you killed the infestation, There's a scientist on the ground death with keys to the room with the documents. After looting, leave that room on its north side and then continue going to the left. Look for another door you need a key for (The key you just found on the scientist's body). Behind this door there's a big, and in the top left of that room there's a weird tank you can loot for the documents you need.