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−320 degrees Fahrenheit, liquid hydrogen is one of the most combustible and dangerous explosives in the world. James A. Dewar, author of To the End of the Solar System: The Story of the Nuclear Rocket, gets even more specific. “One hundredth of what one might receive from shuffling along a rug and then touching a wall can ignite hydrogen,” Dewar wrote in 2004. To help visualize what the facilities aboveground at Jackass Flats looked like, Barnes likens them to Cape Kennedy. “Imagine a one-hundred-twenty-foot-tall aluminum tower rising up from a plateau of cement surrounded by a deep, concrete aqueduct. Add some huge, spherical thermos-like dewars sitting around, each containing something like two hundred and sixty thousand gallons of liquid hydrogen, and you can visualize the space-launch appearance of things,” Barnes explains. In Atomic Energy photographs from the 1960s, a single set of train tracks can be seen running along the bottom of the cement aqueduct and disappearing into an opening underneath the tall metal tower. “The railroad car carried the nuclear reactor up to the test stand and lifted it into place using remotely controlled hydraulic hands,” Barnes explains. “Meanwhile, we were all underground looking at the reactor through special leaded-glass windows, taking measurements and recording data as the engine ran.” The reason the facility was buried inside the mountain was not only to hide it from the Soviet satellites spying on the U.S. nuclear rocket program from overhead, but to shield Barnes and his fellow workers from radiation poisoning from the NERVA reactor. “Six feet of earth shields a man from radiation poisoning pretty good,” says Barnes.

When running at full power, the nuclear engine operated at a temperature of 2,300 Kelvin, or 3,680.6 degrees Fahrenheit, which meant it also had to be kept cooled down by the liquid hydrogen on a permanent basis. “While the engine was running the canyon was like an inferno as the hot hydrogen simultaneously ignited upon contact with the air,” says Barnes. These nuclear rocket engine tests remained secret until the early 1990s, when a reporter named Lee Davidson, the Washington bureau chief for Utah’s Deseret News, provided the public with the first descriptive details. “The Pentagon released information after I filed a Freedom of Information Act,” Davidson says. In turn, Davidson provided the public with previously unknown facts: “bolted down, the engine roared… sending skyward a plume of invisible hydrogen exhaust that had just been thrust through a superheated uranium fission reactor,” Davidson revealed. Researching the story, he also learned that back in the 1960s, after locals in Caliente, Nevada, complained that iodine 131—a major radioactive hazard found in nuclear fission products—had been discovered in their town’s water supply, Atomic Energy officials denied any nuclear testing had been going on at the time. Instead, officials blamed the Chinese, stating, “Fresh fission products probably came from an open-air nuclear bomb test in China.” In fact, a NERVA engine test had gone on at Area 25 just three days before the town conducted its water supply test.

Had the public known about the NERVA tests when they were going on, the tests would have been perceived as a nuclear catastrophe in the making. Which is exactly what did happen. “Los Alamos wanted a run-away reactor,” wrote Dewar, who in addition to being an author is a longtime Atomic Energy Commission employee, “a power surge until [the reactor] exploded.” Dewar explained why. “If Los Alamos had data on the most devastating accident possible, it could calculate other accident scenarios with confidence and take preventative measures accordingly.” And so, on January 12, 1965, the nuclear rocket engine code-named Kiwi was allowed to overheat. High-speed cameras recorded the event. The temperature rose to “over 4000°C until it burst, sending fuel hurtling skyward and glowing every color of the rainbow,” Dewar wrote. Deadly radioactive fuel chunks as large as 148 pounds shot up into the sky. One ninety-eight-pound