Ivara Quill remained on the Tier Two staging platform for twenty minutes after the miners’ boots had clattered up the haulage stairs.
She stood alone beside the heavy timber guardrail of the hoist pit. Her single right hand held her brass tone check tube against the limestone bedrock. The listening cone—cast from three pounds of high-thickness naval bronze, fitted with a stretched mica membrane that could detect a mouse scurrying across mine ballast forty arm-lengths down—was clamped firmly to a dressed granite leveling pin driven into the floorboards.
She pressed the horn-rimmed earpiece to her right ear. She closed her eyes against the yellow lantern light.
Through the cold bronze tube came the underground heartbeat of Rookvale.
She heard the deep, rhythmic grinding of the central Star tower generators three miles to the north. A low, heavy-duty thrum that shook at eight cycles per second, the sound of twelve years of tightly packed sky-high sunlight fighting the magnetic pushback of Chancellor Morn’s collector coils. She heard the wet, hollow drip of drainage water chutes in the Tram basin beneath Platform Four, where millions of gallons of waste runoff hissed through cracked sewer pipes. She heard the distant, muffled rumble of melted rock waste cars rolling along the Salt Ward embankments, the iron wheels screeching against the cold rails.
