On the clinic rooftop, there should be, at least, two armed mercenaries.
you’re able to defeat them, although this is not required by the game.
This is so, because the clinic entrance is not on the rooftop, but on the ground floor.
Walk around the zombies and walk under the partially raised gate.
Watch out for more bandits that await you at the other side of the gate.
They only use melee weapons so, eliminating them should prove to be much easier.
After you have secured the area, approach the elevator and summon it with the button.
Wait for the elevator to take you to the underground complex.
Walk over to the toilet, where you will have to use your weapons again.
Locate the opened venting shaft, get inside and get, this way, into the security room.
The upper path leads you to the room with green toxic fumes.
Stay away from them or you lose your health points quickly.
I recommend that you climb to the ledges above, thanks to which you get around the infected here.
Note that lowering the forklift’s load unblocked access to another venting shaft.
Climb there and follow the shaft.
In the next room, you gotta reach another forklift but, watch out for the bandit here.
After the load changes its position, walk under it to exit the room.
Return to the big corridor and head on.
Attack the zombies in the distance with, e.g.
You should be more careful with the mutant around here.
You do not need to fight him, because you might dodge to the side, after he charges.
you’ve got the option to now reach the decontamination chamber that used to be inaccessible.
Walk over to the neighboring room to meet with doctor Camden.
After the conversation backtrack towards the elevator (fortunately, you will not run into any monsters anymore).
(point 6bon the map).
After you get to the very top, make Crane have a conversation with Rais.
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