Underground Facilities Database
United States of America
Documented underground facilities, continuity of government sites, and subterranean infrastructure within the United States
4
Facility Records
1
Confirmed Grade
COG
Primary Function
Facility Records — United States
The Greenbrier Bunker
Project Greek Island
Status
Decommissioned
Location
White Sulphur Springs, WV
Built
1958–1961
Depth
720 ft
Mount Weather EOC
FEMA / DoD Continuity of Government
Status
Active — Operational
Location
Bluemont, Virginia
Surface Area
564 acres
Function
COG / Disaster Command
Raven Rock Mountain Complex
Site R — The Underground Pentagon
Status
Active — Operational
Location
PA-MD Border
Surface Area
650 acres
Function
DoD Emergency Command
Olney Federal Support Center
FEMA Secure Communications Facility
Status
Active — Operational
Location
Olney, Maryland
Surface Area
Not publicly confirmed
Function
Secure Comm Hub
CHEYENNE MOUNTAIN COMPLEX
NORAD Combat Operations Center
Status
Active — Operational
Location
El Paso County, Colorado
Depth
~2,000 ft in granite
Function
Alternate Command — NORAD