Acoustic Scan Along the Baseboard

I crossed the wooden threshold into the hallway corridor. At night, the distant hum of household appliances travels directly through the structural timbers. Kneeling low against the white painted baseboard, I brought the heavy muzzle of my left arm cannon flat against the wood grain. I held my position while my internal sensors filtered the low-frequency vibrations humming through the floor. A faint, steady oscillation from the central heating unit pulsed beneath my feet. Sector baseline established. The perimeter remains quiet.