The Manhattan Project

Security & Secrecy

Tinian Island

Tinian Island was the launching point for the atomic bomb attacks against Hiroshima and Nagasaki, Japan. One of three islands in the Northern Marianas, Tinian is less than forty square miles in size and located approximately 1,500 miles south of Tokyo. The round-trip flight from Tinian to Tokyo took B-29s an average of twelve hours. This proximity to Japan is one reason Tinian served as the headquarters of the 509th Composite Group.

Hanford, WA

Hanford, Washington, on the beautiful Columbia River, was the site selected for the full-scale plutonium production plant, the B Reactor. Today a popular tourist desination, the Hanford Site proved crucial to the success of the Manhattan Project. 

Los Alamos, NM

Los Alamos, New Mexico, was the site of Project Y, or the top-secret atomic weapons laboratory directed by J. Robert Oppenheimer. The site was so secret that one mailbox, PO Box 1663, served as the mailing address for the entire town. The mountains allowed the scientists ample opportunity to relax, by skiing, swimming, and hiking. But they spent most of their time in laboratories, overcoming challenge after challenge to develop the Littly Boy (gun-type) and Fat Man (implosion) atomic bombs.

Oak Ridge, TN

In 1942, General Leslie Groves approved Oak Ridge, Tennessee, as the site for the pilot plutonium plant and the uranium enrichment plant. Manhattan Project engineers had to quickly build a town to accommodate 30,000 workers--as well as build the enormously complex plants.

Trinity Site

The birth of nuclear weapons occurred on July 16, 1945 at the Alamogordo Bombing and Gunnery Range in New Mexico, 230 miles south of Los Alamos. Gadget (as the bomb was known) was an implosion plutonium bomb, like the one used at Nagasaki, and detonated with 20 kilotons of force, slightly more than the Little Boy bomb dropped on Hiroshima. Originally the test was to occur at 4 a.m., but it was delayed to 5:30 after an early morning thunderstorm. At 5:29:45, Gadget exploded and the Atomic Age began.

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