In 1939 Franklin D Roosevelt received a letter from Albert Einstein, warning him that the Nazis might be developing nuclear weapons. America has to act fast.What follows is the creation of a secret city in the rural area of Oak Ridge, Tennessee. Around 75,000 people moved to the secret city during World War Two, and the first atomic bomb was developed in just 28 months.Don Wildman is joined by historian, Ray Smith, to find out how it was possible, and to hear about the experiences of the people who worked at Oak Ridge, most of whom didn't know what they were creating.You can find out more here.The senior producer was Charlotte Long. The producer was Benjie Guy. Mixed by Thomas Ntinas. Special thanks to Fendall Fulton.If you'd like to learn more, we have hundreds of history documentaries, ad-free podcasts and audiobooks at History Hit - subscribe to History Hit today!To download the History Hit app please go to the Android or Apple store.Complete the survey and you'll be entered into a prize draw to win 5 Historical Non-Fiction Books- including a signed copy of Dan Snow's 'On This Day in History' Hosted on Acast. See acast.com/privacy for more information.