I climbed into a vent at the start if mission 6, I am trying to use the rewire to open the vent but no matter what I do, it won’t open. I can’t seem to go back either. I am stuck inside the vent with no way out and no way back. Is there a way I can undo this and get out?
Apparently this is a common glitch that cannot be fixed. The best you can do is reload a past save and hope that your game saves are not too old.