Hitman Absolution Purist Guide: Death Factory, Decontamination, Disable Security System

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This is the second part of the Death Factory Mission in Hitman: Absolution. In it you make your way through the decontamination area of the facility, disable the security and make your way to the silo entrance. This guide explains how to get through this part of the mission on the hardest, purist, difficulty. It does not explain how to complete the different challenges in this area.
At the start make your way down the corridor. Pick up one of the bottles off the table ahead. Make sure you stay as close as possible to the left wall when you walk past the door the guard entered.
Keep going down the corridor until you get into the locker room. Go behind the rightmost row of lockers and throw the bottle into the back left corner of the locker room.
Whilst the guard is distracted go towards the security room. On the wall facing you all the way to the right is a window you can climb through to enter the security room undetected.
Once you are inside disable the security on the computer ahead. Then go into the bathroom. On the left wall is an air ventilation shaft.
Go through the air ventilation shaft. Once you are on the other side crouch and crouch walk to the exit door. Once you go through that door it is the end of this part of the mission.