In practice, the CHDACN network was a paradoxical blend of meticulous planning and gallic improvisation. Each center was staffed by a skeleton crew of PTT (Postes, Télégraphes et Téléphones) engineers and civil defense officers. Annual exercises, such as Opération Hirondelle , simulated nuclear strikes and the activation of the “hardened prefect.”
Act 3 — Experiencing a Chdacn (90–120s) chdacn buildings
Innovation in materials is a hallmark of this architectural wave. In practice, the CHDACN network was a paradoxical