The secret lab you're referring to is known as Project Y, part of the Manhattan Project that produced the first atomic bombs during World War II. Project Y was located in Los Alamos, New Mexico, USA. The Los Alamos National Laboratory, as it's now known, continues to be a center for research in a diverse range of scientific disciplines. Remarkable figures like Robert Oppenheimer, Richard Feynman, and many other world-class scientists were part of this critical project in history.