Repository Magnetic 10 9 Zip Top -

The repository sat beneath the old transit line like a secret kept between concrete and rust. It had a name only a few remembered—Repository Magnetic 10-9—and people called it by its shorthand the way sailors name storms: with respect and a little fear. Aboveground, the city hummed with predictable routines; below, corridors wound in a deliberate geometry designed for one thing: keeping things that could not be trusted from touching anything else.