Fat Man and Little Boy

Fat Man and Little Boy a.k.a. Shadow Makers in the UK is a 1989 film that reenacts the Manhattan Project, the secret Allied endeavor to develop the first nuclear weapons during World War II. The film is named after the weapons Little Boy and Fat Man detonated over Hiroshima and Nagasaki, respectively. The code names, originally Fat Man and Thin Man, were drawn from characters in the works of Dashiell Hammett. However, theres a possible secondary allusion to stout project director Gen. Leslie Groves and the slim scientific director, Dr. J. Robert Oppenheimer. The film focuses much attention on the frequently strained relationship between the two men.

In September 1942, U.S. Army Corps of Engineers General Leslie Groves Paul Newman who oversaw construction of the Pentagon is assigned to head the ultrasecret Manhattan Project, to beat the Germans in building an atomic bomb.Groves picks University of California, Berkeley physicist J. Robert Oppenheimer Dwight Schultz to head the team of the project. Oppenheimer was familiar with northern New Mexico from his boyhood days when his family owned a cabin in the area. For the new research facility, he selects a remote location on top of a mesa adjacent to a valley called Los Alamos Canyon, northwest of Santa Fe. ........

Source: Wikipedia