Perimeter “Dead Hand”: A Nuclear Retaliation System for a Destroyed Command Center

In 1974, the Soviet Union approved development of Perimeter, a semi-automatic system meant to preserve the ability to transmit a nuclear retaliation order after a command center was destroyed. Western media often called it “Dead Hand.” The name brings to mind a machine that presses an apocalypse button. Public accounts describe something more involved: a system embedded in the command network for a crisis in which leaders and communications might be lost.

During the Cold War, Soviet planners feared a decapitation strike. If a first attack destroyed the Kremlin, communications centers, and command posts, the United States might conclude that the Soviet Union could no longer retaliate. An opponent who believed that might consider striking first. Perimeter was intended to disrupt that calculation. Destroying the leadership would not necessarily eliminate the ability to launch a response.