Yeah, that's where I'm stuck too. I don't know if you made it to where I made it or not, but I'm stuck in the same area.
For you Jordan, go back inside the refrigerator thing from the second floor, but don't fall to the ground. Walk around the edge staying on the second floor, and go to the side where the arm is (the thing that looks like it rotates in the freezer room). Jump up that, and there's some more stuff up there. Make sure to go the other way (instead of straight across, walk along the edge on the outside of the freezer to the back) also to get the secret room.
I've killed everybody, and done everything I can think of, but I'm stuck again. I still haven't gotten that door open. How do you get all the things inside the hanger, where everything is up on ledges?