Me and my whole 10 Person squad got killed on the NWA by a Glitcher who stayed in the Firestation. We are not 100% if he was a hacker but maybe
I have tried to get in or reproduce the glitch but I was not ablte to do it.
He was in the big not enterable part of the Firestation
All areas in in fire stations are able to be entered.
Stairs... you just have to vault near them and then turn your character towards the stairs and voila.
The wrong thing is that in fire stations you can't go up stairs normally and you can go to the ladders through walls. That is wrong.