I didn't make it!
I need help on the Guass gun mission as i'm in the but can't get to the mission point as the door is locked from the other side and i killed the big mutant..
Go talk to the drunken tech in Creek. Oh sorry you did, uh ... look up!
in the room with the big mutant, and the firing test range thingie.. there is stairs going up onto a broken balcony. Then you will see a white ladder.. climb up and go onto the walkway above, make your way to the big red door and there is a white ventilation shaft on the right. drop down into it and this will get you inside that Gauss room.