The shutter mentioned earlier is a very good solution to getting close to the room 899.
Surroundings of the closed elevator on the eighth floor are guarded by at least 2-3 enemies.
So you should stay away from them, use covers or wait until they split up.
A small projector room is occupied by two guards.
One of them goes to the side staircase from time to time, which should make your life easier.
The door leading to room 899 should be guarded by a single enemy, regardless of the difficulty level.
Opening the room 899 door doesn’t officially end the mission.
The last thing you have to do is to enter the right ventilation shaft (screen above).
When you get inside, crawl forwards until the last cut-scene is displayed.
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