The Greenbrier Bunker, officially known as Project Greek Island, was a secret United States government continuity facility located beneath the Greenbrier resort in White Sulphur Springs, West Virginia. Built between 1958 and 1962 during the Cold War era, this underground facility was designed to house and protect the United States Congress in the event of a nuclear attack. The bunker remained operational for over thirty years, maintained by a small team of government employees who worked undercover as television repairmen for the resort.
The facility was decommissioned in 1992 after its existence was revealed by The Washington Post, ending one of the most closely guarded secrets of the Cold War period.