The book argues that mesons and heavy resonances may already show that accelerators can assemble compact debris balls. Most are harmless and short-lived, but neighbouring dark or metastable structures could, in principle, amplify corridors, seed exotic force geometries, or condition matter into unsafe registry states. The book does not claim existing accelerators are known to be dangerous. It argues that under Stein Theory, some risks remain insufficiently bounded and deserve explicit safety review before further increases in energy, luminosity or AI-directed particle search.