The Manhattan Project: Race to the Atomic Bomb · 10 Aug 2026 · 13 min

Klaus Fuchs, Ted Hall & the Secrets That Left Los Alamos

The Manhattan Project was history's most guarded secret — yet the Soviets knew how to build the bomb before it ever dropped. Meet the spies inside Los Alamos: Fuchs, Hall, and Greenglass, and understand why they chose to betray it.

The Manhattan Project: Race to the Atomic Bomb
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Klaus Fuchs, Ted Hall & the Secrets That Left Los Alamos

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What's covered

The Secret That Wasn't Kept

Here's something worth sitting with. The Manhattan Project was the most tightly guarded secret in American history.

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The World Inside the Fence

By nineteen forty-three, Los Alamos sat on forty-six thousand acres of New Mexico high desert. General Leslie Groves had selected the site precisely because it was nowhere.

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Klaus Fuchs

Klaus Fuchs arrived at Los Alamos in August of nineteen forty-four. He was a theoretical physicist.

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Ted Hall

Theodore Hall was nineteen years old when he arrived at Los Alamos. He was, at that point, one of the youngest scientists on the project, a Harvard physicist who'd graduated at eighteen.

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David Greenglass

David Greenglass was not a physicist. He was a machinist.

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What They Actually Gave Away

The question that matters is what this espionage actually changed. The Soviets detonated their first atomic device in August of nineteen forty-nine.

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The Paradox of the Believers

Here's the part that doesn't fit neatly. Fuchs, Hall, and Greenglass were not mercenaries.

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The Reckoning

Security at Los Alamos had been rigorous. Compartmentalization was the dominant principle.

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What It Left Behind

The men and women who worked at Los Alamos mostly went home after the war and built ordinary lives. Some stayed in physics.

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