Groves, meanwhile, supervised the construction of two facilities even more ambitious than the Pentagon, all in secret. The first was at Oak Ridge, Tennessee, where uranium would be enriched for bomb making. The main building where this work took place spread out across forty-four acres, making it the largest building in the world. Housing had to be constructed for tens of thousands of workers, who had no idea what it was they were laboring to produce, because the project was so secretive. The site was not far from the city of Knoxville. “While I felt that the possibility of serious danger was
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