Mount Weather Emergency Operations Center

"underground facility designed to house key components of the American government in the case of nuclear warfare or other calamity."

The Mount Weather Emergency Operations Center is a civilian command facility in Virginia used as the center of operations for the Federal Emergency Management Agency (FEMA). Also known as the "High Point Special Facility" (HPSF), its preferred designation since 1991 is "SF".^[1]
The facility is a major relocation site for the highest level of civilian and military officials in case of national disaster, playing a major role in U.S. continuity of government (per the Continuity of Operations Plan).^[2]
Mount Weather is the location of a control station for the FEMA National Radio System (FNARS), a high frequency radio system connecting most federal public safety agencies and U.S. military with most of the states.^[3] FNARS allows the president to access the Emergency Alert System.^[4]
The site was brought into the public eye by The Washington Post, when the government facility was mentioned while reporting on the December 1, 1974, crash into Mount Weather of TWA Flight 514, a Boeing 727 jetliner.