TRY GOING TO THE CLOSET MY DAD TRIED IT

Try this !!!! After you get out of the elevator , go to the first door on your right. once in the room go left , and in between the crate and the shelf is the gas mask !!!!!!!! hope i helped !!!!!

come off the elevator kill the two guys immediately go to your left and go in the first door on the left walk in go to the right and the gas mask is laying on the floor.

wat ever u ****in fags!!=]

When u come out of the elevator kill the guys then go in the first door on the left then
look on the floor

where do you find a mask?