The Raven Rock Mountain Complex, also known as Site R or The Rock, is a highly classified U.S. military installation featuring an extensive underground nuclear bunker located near Blue Ridge Summit, Pennsylvania. This facility serves as a critical continuity of government site, housing emergency operations centers for the United States Army, Navy, Air Force, and Marine Corps. Often referred to as an "underground Pentagon," the complex was designed to ensure command and control capabilities during and after a nuclear attack.
Its remote mountain location provides natural protection, while its sophisticated infrastructure supports secure communications and strategic operations.