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16 July 1945Reputable source · 2 sourcesWell documented

A tower in the New Mexico desert vanishes in a flash brighter than the sun

On the timeline · around 16 July 1945 · Allied VictoryAllied VictoryA tower in the New Mexico desert vanishes in a flash brighter than the sun19451946

What happened

At 5:29 in the morning on 16 July 1945, Manhattan Project scientists detonated the first nuclear weapon in history in the New Mexico desert, about 200 miles from the Los Alamos laboratory where it had been designed. The device, a plutonium implosion bomb nicknamed the Gadget, sat atop a 100-foot steel tower that the blast completely vaporized, fusing the surrounding sand into a green glass later called trinitite. Scientific director J. Robert Oppenheimer had code-named the test Trinity, inspired, he said, by the poetry of John Donne. The explosion released energy equivalent to roughly 18.6 kilotons of TNT and produced radioactive fallout that spread across an area some 250 miles long, exposing nearby communities who were never warned or evacuated. Afterward, Oppenheimer told his brother Frank only two words: it worked. The now-famous line often attributed to him at that moment, quoting the Bhagavad Gita's Now I am become Death, the destroyer of worlds, was not something he said that morning; he first gave that account twenty years later, in a 1965 television interview.

Why it matters

Trinity turned the atomic bomb from a theoretical calculation into a working weapon three weeks before its first use on Hiroshima, meaning that when Truman met Stalin at Potsdam a little over a week later, the United States could speak from possession of a functioning weapon rather than a projection. The test also produced the first radioactive nuclear fallout in history, and the exposed New Mexico communities downwind of the blast, now called the Trinity downwinders, went without formal federal acknowledgment or compensation for decades.

How we know

The US Department of Energy's Office of Legacy Management holds the declassified Manhattan Engineer District technical reports that establish the exact yield, tower height, and detonation time, and the National Park Service's own history of the site corroborates both the it worked exchange between Oppenheimer and his brother and the twenty-year gap before Oppenheimer's later, more famous quotation of the Bhagavad Gita.

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A tower in the New Mexico desert vanishes in a flash brighter than the sun · World War II · SourcedStory