Key
"Stairs" were transportation structures mainly used within the Control General Bureau to connect different areas.
Under Headless Brother's guidance, everyone stepped into the entrance marked No. 9 beforehand.
The structure of these stairs resembles the main building of the Whisper Knight Order, similar to the Penrose Stairs, except the dimensional extension here runs even deeper.
As long as such dimensional stairs are used as connecting structures, no distance will be a problem, no matter how vast the Control General Bureau is.
They save time while also making security control over each area more convenient.
If I'm right, the main control room should be able to alter, seal off, or even directly erase the stairs... to deal with emergencies involving the escape of Uncontrolled Ones.
When Han Dong stepped onto the stairs, his wristband vibrated.
Individual detected entering the Shallow Layer—Stairs. Holographic automated navigation has been activated. Please select your destination.
Every area accessible through Stairway No. 9 was projected before him.
They included the preliminary general management district, dispatch divisions (Nos. 1–10), diversion data processing departments, and more.
Among them, "General Management District (Shallow Layer)" and "Main Spindle Chamber" were marked with blue backgrounds.
"The Shallow Layer? Are we currently on the outermost layer of the B.B.C.?
"And what does Main Spindle Chamber mean...?"
Curious, Han Dong tapped the panel. The database embedded in his wristband immediately displayed the relevant explanation.
Main Spindle Chamber—Layer Connection
The Black Tower Control General Bureau divided its interior into the Shallow Layer, Middle Layer, and Deep Layer through "layers." Different layers were completely isolated through subspace technology.
The Main Spindle Chamber was the only area through which one could cross layers.
Note: Other than the Director, anyone wishing to cross layers must receive direct authorization from the person in charge of their current