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I seem to be stuck (again). After alex starts comm. with me via radio headset, and I dropped out of that vent shaft. A few rooms away theres this room with what looks like 2 generators and then a while further a room with a force field with a power line leading to an outlet nearby in a office/room. I tried to pull this plug but I can not. How do I disable this force field, or is there another way out. In the room with the grate which I dropped out of, there is also a double door with unbreakable glass surrounding it and I can see a supply crate on the other side of it... but I can not open the door.