Light Out - [s1e1]

He felt a primal shiver. In the 'Old World' stories his grandfather told, darkness was just the absence of light. In 2140, darkness was the absence of everything . Without the Grid, the doors were locked, the water wouldn't pump, and the oxygen scrubbers were on a ticking clock.

A faint green glow caught his eye from the street level. It wasn’t an emergency light. It was moving—a rhythmic, pulsing emerald bioluminescence. Then another appeared. And another. They were emerging from the subway vents, thousands of tiny, glowing fractures in the dark. The "Light Out" wasn't a malfunction. It was a harvest. [S1E1] Light Out

No chime. No holographic interface projected from his wrist. His personal AI, the tether to his entire life, was dead. He felt a primal shiver