Clara Vance felt the vibration through the soles of her sneakers before she heard the sound.
It started as a deep, resonant hum that rose from the frosted glass tiles beneath her feet.
Then came the mechanical clatter.
[clack-slide, clack-slide, clack-slide]
Across the three-mile expanse of Sub-Level 3, ten thousand olive-drab steel Kardex filing drawers sprang open at once.
The sound was like a massive pipe organ built of sheet metal and ball bearings, vibrating through the cavern.
“Julian, look at the cabinet walls!” Clara called out, pressing her 89.9 FM crystal tuner against her collar.
Every single drawer along the towering forty-foot tiers was bathed in a gentle, warm glow.
