Knock out the guard from behind
From Create Your Own Story
You cautiously move behind the guard and ready your binaca knockout spray. You move around to his side and as he starts to react, you give him a blast of the spray in his face, knocking him out instantly. He slumps in his chair and his head slams face first into the desk. You notice a storage closet near the desk and open it, dragging the guard into it and shutting the door.
You move into the dead end hallway and notice doors with small windows on both sides. You examine them and notice they are all identical rooms that look to be detention cells. At the moment they are all empty... but what would ALERON need with them?
It doesn't appear that there is any reason for you to be here. You can either head out into the large weapon and drug room, which is swarming with guards, or head back upstairs and figure a way to get to Ivan.