The other three erbium dowels in the same lot were inspected and revealed no plastic explosive. (Soviet and Japanese crews had performed a range of remote sensing experiments before daring to split their dowels open.) Somebody had carefully packed a tamped charge and timer into the cavity near the end of the construction process in Terre Haute. Once out of the factory this dowel—and those from other batches—had been transported by special train and under armed guard to Wyoming. The timing of the explosion and the nature of the sabotage suggested someone with knowledge of the Machine
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