I'm on Xbox, if you even test for non PS platforms anymore. I'm entering the final doorway to the boss, which is guarded by 5 or 6 turrets and a MiniGun Cabal, solo as my sneaky invis hunter. To save some time I elect to go dodge invis, run down the right hand side in the lower portion against the wall, stab the first turret on that side with my Gaive to go invis again and wait for the door to open. I fall through some apparent gap in your fecal map and fall into the space below the floor, under the turrets. You can't shoot the turrets and you can not climb back up either - there are barriers to prevent you from getting out. Maybe hire some people to test your game before laying a big stinky wet log on the floor.