and control bunkers, the most famous of which is that of NORAD, which is tunneled a few thousand feet into the granite of Cheyenne Mountain Complex, outside Colorado Springs, Colorado. It is believed to be able to withstand and to continue to operate after a nuclear direct hit. Other US C4ISTAR bunkers include an installation called Site R, located at Raven Rock, Pennsylvania, which is believed to be the Pentagon's relocation site if Washington, DC, is destroyed, as well as Mount Weather, located in Virginia, which is believed to be the relocation site for top executive branch officials. The Greenbrier, located in West Virginia, was once the site of the Supreme Court of the United States and Congress's relocation bunker, but it is no longer a secret but is now a tourist attraction. The Russians also have equivalent or superior capabilities in that area and have a system called SPRN (СПРН), which can detect nuclear launches and providing early warning so that any such strike would not be undetected until it is too late. However, their unique and special capability can be found with their Dead Hand fail-deadly computerized nuclear release system, which is based at Mount Yamantaw in the Urals. Apparently, Dead Hand, named for either the dead man's hand in poker or the dead man's switch in dangerous or deadly machinery, can be turned on whenever the Russian leadership fears a nuclear attack. Allegedly, once Dead Hand is activated, if it detects a loss of communications with Moscow as well as nuclear detonations inside Russian territory, it can give final authority for the release of nuclear weapons to military officers in a bunker under Mount Yamantaw, who can then, if they so determine, launch Russia's arsenal. Mount Yamantaw is believed to be capable of withstanding multiple direct nuclear detonations. Decreasing tensions by mutual adoption of minimum credible deterrent posture Instead of relying on sophisticated communications links and launch-on-warning postures, the French, the British, and the Chinese have chosen to assume different nuclear postures more suited to minimum credible deterrence or the capability to inflict unacceptable losses to prevent the use of nuclear weapons against them, rather than pursuing types of nuclear weapons suitable to first-strike use. China is believed to pursue a minimum credible deterrent/second strike strategy with regards to the US. That may or may not be true with regards to China's stance with regard to Russia,