If there’s an important post in America’s national defense establishment, chances are that William Perry has held it. He worked as a civilian expert in electronic intelligence in the 1960s, served as undersecretary of defense for research and engineering, and ended his career in government service as President Bill Clinton’s defense secretary from 1994 to 1997. He served on the University of California’s board of governors for the laboratory at Los Alamos—where the first nuclear bomb was developed—and is currently the head of the board at the Bulletin of the Atomic Scientists. Even at 91 years old his voice still exudes authority, and his words demand attention in capitals around the world.

What makes Perry special, however, is that he is one of the last living American statesmen who saw with his own eyes just how close we came to nuclear annihilation. And what he came to understand was that the real threat of nuclear war wasn’t from military competition, but from the way that simple misunderstandings and technical errors could spiral out into planetary catastrophe. It wasn’t the war in nuclear war that was so dangerous—it was the nuclear, the fact that thousands of megatons of explosive power kept on a hair trigger made any mistake irrevocable……

Perry got involved in what would become known as the Cuban Missile Crisis.  …..

What the Americans didn’t know was that the sub had been out of touch with Moscow for days. When depth charges began exploding around the sub, the crew had every reason to believe that World War III had begun. An exhausted Captain Valentin Savitsky gave the orders to prepare the sub’s nuclear torpedo for firing. A successful hit on the Randolph would have vaporized the aircraft carrier, which in turn would have put the U.S. nuclear war plan for total retaliation into play. Thousands of American warheads would have been on their way to targets in the Soviet Union, China, and other nations. The Soviets would have responded, and the worst would have come true.

The decision to launch a nuclear weapon on board the Soviet sub had to be authorized by three officers. Ivan Maslennikov, the deputy political officer, said yes. But Vasili Arkhipov, Savitsky’s second in command, refused. He convinced Savitsky to instead bring the sub to the surface, where a U.S. destroyer ultimately allowed the ship to return to Russia.  ……..

The Cuban Missile Crisis is only the best known of many, many times when World War III was almost triggered by accident. William Perry himself lived through one when he was serving in the Department of Defense in 1979 and was awakened in the middle of the night by a watch officer at NORAD who said his monitors were showing two hundred Soviet intercontinental ballistic missiles (ICBMs) en route to the United States. It turned out to be a computer error.

Perhaps the closest the world came to nuclear war after the Cuban Missile Crisis was on September 26, 1983, with the reported launch of several ICBMs from the United States. Lieutenant Colonel Stanislav Petrov was on duty that night, and his job was straightforward: register the missile launch and report it to Soviet military and political command.

An ICBM takes half an hour to reach its target, which meant Petrov had only minutes to authenticate the apparent attack in time for the Soviets to launch a counterattack. Yet Petrov judged that the United States would not launch a first strike with only a handful of missiles, so he instead reported a system malfunction. And then he waited. “Twenty-three minutes later I realized that nothing had happened,” Petrov told the BBC in 2013. “If there had been a real strike, then I would already know about it. It was such a relief.”

Excerpted from End Times by Bryan Walsh. https://www.popsci.com/end-times-nuclear-war-accidents/