Burlington Bunker, also known as Site 999, is a vast Cold War-era underground complex located beneath the RAF Corsham base near Corsham in Wiltshire, England. Constructed in absolute secrecy during the 1960s, its primary function was to serve as an emergency relocation site for the British government and key civil servants in the event of a nuclear attack on the United Kingdom. For decades, it was one of the most closely guarded secrets of the Ministry of Defence, designed to ensure the continuity of government operations from a location approximately eighty feet below ground.
The bunker's architecture is a testament to Cold War engineering, featuring a labyrinth of tunnels and hardened concrete chambers capable of withstanding a near-miss from a nuclear weapon. Its design included extensive life support systems, communication facilities, accommodation, and operational rooms to sustain several hundred people for an indeterminate period. The complex was integrated into the existing ** Corsham** stone quarry workings, utilizing the natural geology for additional protection.
Geographically, its location in Wiltshire was chosen for its perceived remoteness from primary Soviet nuclear targets while remaining within feasible travel distance from London. Following the end of the Cold War and the diminished threat of nuclear war, the bunker was decommissioned in the 2000s. Its existence has since been publicly acknowledged, and parts of the site have been the subject of tours and media access, transitioning from a top-secret military bunker to a historical relic of the nuclear age.