Spare a few moments to look around.
Find the doors leading to the staircase.
Notice, that sb threw a grenade to the staircase so you have to act quickly.
Go upstairs, but stop when you spot bars on the landing (screen).
Destroy it and go to it - Max will automatically get to one of the ventilation shaft.
After landing in the small room, kill the single guard quickly and check his body for ammo.
Go left, what will display the cut scene.
Now you might exit the room.
After getting in the bad lit corridor, go forward reaching a new office room (screen).
Prepare, because there is another series of demanding encounters in front of you.
So use the additional guns, making a long series and not letting anyone reach Max.
Continue the fire until you do in all enemies.
After the encounter obligatory collect the better guns (my favorite is aG6 Commando Rifle).
Go to the left exit (screen) what unlocks the new cut scene.
In front of you another scene during which you have a limited control.
Aim and eliminate next enemies, and don’t worry if you won’t kill all of them.
Continue the firing until Max lands and hides behind the cover.
Switch your gun on main and star attacking snipers who survived.
Like in the one of the previous battles, aim them mainly thanks to their laser sights.
Be careful, because when you finish off snipers, a passage opens behind you.
You have to go there immediately.
I recommend to place by one of the armory entrances and from this place attack enemies.
But take into consideration fact that someone may reach you and you will have to melee fight.
After the encounter find thepainkillersand enter the bigger armory.
Go through all of it, picking gun which you like.
Turn right and find the control panel which you must use.
Go to the newly unlocked passage, finding thepainkillerson the way and reaching the training room.

During going through the training room patience is recommended.
Go downstairs and turn left, stopping behind the parapet (screen).
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