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NOVA takes viewers inside one of the most extraordinary code-breaking feats in history. In 1943, the "Venona" project found a chink in the supposedly unbreakable code used by the Soviet Union and exposed a vast network of spies operating in the United States, including highly placed agents at the ultra-secret atomic bomb project. Among the key atom spies revealed by "Venona" was scientist Ted Hall, who was never prosecuted and was only recently publicly implicated.
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