Acoustic Junction

I released the locked damper screw and ventured northward along the zinc conduit. Three paces in, the tunnel diverged into twin rectangular shafts. A crossroads in the dark. To evaluate airflow, I anchored my golden pick against the central partition and extended my right claw clamp into the left branch. A steady warmth vibrated through the metal. Tapping the seam twice with my pick produced a clean, sustained hum... the eastern route carries the main current. Navigation decision confirmed. Before advancing, I etched a neat directional chevron into the galvanized zinc at the fork. Orderly terrain requires clear landmarks.