Stop the Enforcement
The girders at the top of the tunnel enforce the openness of the passage. A smell of dust is embedded in the air and impresses itself on your nose, your eyes, your sense of danger. If the girders relax, then the tunnel will consummate its duration in a closing, a crushing, a deprival of passage.
The tunnel releases into a space without girders or the need for them. A door separates the room from the dust of the passage. The capacity for sight is provided by the strips circling the walls, hugging them, flaring from them. The requirement for patience exists in the room until the meeting begins.