During the early years of World War II, American ships crossing the Atlantic with oil and supplies were virtually defenseless against German U-boats. Bombs and torpedoes fitted with TNT barely made a dent in the tough steel plating that covered the hulls of Axis submarines and ships. Then, seemingly overnight, a top-secret, $100 million plant appeared near Kingsport, Tennessee, manufacturing a sugar-white substance called Research Department Explosive...
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