Alamogordo is the geographic reference point for the remote southern New Mexico site where the Trinity test was conducted. The test did not take place in the city: its grounds lay about sixty miles northwest, in the Jornada del Muerto. The connection is nevertheless central to the place’s significance in the book, which follows the selection of the desert site, its conversion into a military test ground, and the explosion witnessed from the surrounding landscape.

Choosing the desert site

In the spring of 1944, J. Robert Oppenheimer spent three days and nights crossing the dry valleys of southern New Mexico in a three-quarter-ton Army truck, searching for an isolated place where an atomic bomb could be tested safely. Kenneth Bainbridge and Army officers, including security officer Peer de Silva, accompanied him. At night they slept in the truck’s flatbed to avoid rattlesnakes; de Silva later recalled Oppenheimer lying in his sleeping bag beneath the stars and reminiscing about his student days at Göttingen. The arduous search eventually led to a site about sixty miles northwest of Alamogordo.

The surrounding landscape was valued for its isolation, but establishing the test range also transformed it into a controlled military space. The Army marked out an area eighteen by twenty-four miles, removed a few ranchers through eminent domain, and built a field laboratory and hardened bunkers from which the explosion could be observed. Oppenheimer named the test site Trinity. He later recalled a possible connection to a John Donne poem, while the book also notes the possible resonance of the Hindu trinity of Brahma, Vishnu, and Shiva.

Preparing the test grounds

The site’s remoteness did not make preparations simple. Frank Oppenheimer began camping there in late May 1945. The men lived in tents and worked in heat reaching one hundred degrees. As the target date approached, Frank and others mapped escape routes through the desert so that the community could be evacuated if the test went disastrously wrong. The precautions show how the open landscape around Alamogordo was made to serve both as a safety buffer and as the setting for an experiment whose consequences could not be fully predicted.

The need for a full-scale test had itself been contested. Leslie Groves initially opposed risking scarce plutonium, but Oppenheimer argued that without testing the device, planners would have to prepare for its use over enemy territory substantially blindly. Shortly before the scheduled shot, a test firing of the implosion explosives without the plutonium core suggested that the bomb might fail. At an Albuquerque hotel, Oppenheimer was visibly nervous; George Kistiakowsky tried to reassure him by wagering a month’s salary against ten dollars that the implosion charge would work. Oppenheimer recited a stanza from the Bhagavad Gita to Vannevar Bush that evening, as officials and scientists waited on the outcome.

The explosion in the surrounding landscape

On the morning of the test, severe thunderstorms and high winds threatened to delay the shot. Oppenheimer and Groves paced outside the bunker at South–10,000 yards, watching the weather. Oppenheimer feared that a postponement would make it impossible to rally the workers again; Groves was also determined to proceed. They set the shot for 5:30 a.m. as the weather began to clear.

Richard Feynman was twenty miles from the Trinity site. Rather than use dark glasses, he climbed into a truck cab facing Alamogordo, relying on the windshield to shield his eyes from ultraviolet rays while allowing him to see the flash. Even so, he ducked instinctively. When he looked up, the light had shifted from white to yellow and orange, forming a rising ball that billowed into smoke; the enormous report arrived a minute and a half after the explosion. James Conant, expecting a brief flash, initially thought that something had gone wrong and that the whole world had gone up in flames. Their differing reactions make the landscape around Alamogordo part of the event’s human record: distance offered a vantage point, but not emotional or perceptual detachment.

A place defined by Trinity

In the book, Alamogordo functions less as the site of activity than as the nearest named landmark for an immense, deliberately isolated test ground. The distinction matters: the Army’s range, bunkers, and field laboratory belonged to the desert northwest of the city, while Alamogordo gave readers and witnesses a point of orientation. The first explosion made that surrounding landscape inseparable from the emergence of the atomic age, even as the test’s meaning extended well beyond the locality. The same debate over what the weapon could do would later turn on the scale of destruction and the danger of treating technical capability as a sufficient reason for use.