How to Get SMG (Submachine gun)
At Ward 13, which is the main hub, go into the room where there’s a directory, you’ll see a stairwell nearby. Go down the stairs to B2, go into the room and you will need a Ward 13 keycard to open up a door. Scavenge around the area, there’s some pretty good items and things to find around here. You’ll eventually find a fuse, once you do, take that down to B3 which is the research area. Insert the fuse into the fuse box and then turn it on. This will allow you to unlock the door that opens up the area. Once you’ve opened the door, go back to the fuse-box and turn off the power. Go back to where you opened the door, and go through the now turned off exhaust fan so you can get the Ward 13 Master Key.
Go back up to B2, and head down the long hallway and you’ll eventually run into a door that requires the key. Unlock the that door, and you’ll find the Submachine Gun on one of the desks.