As the project continues in multiple sites across America, technical problems and delays cause tensions and strife. To avoid a single point of failure plan, two separate bomb designs are implemented: a large, heavy plutonium bomb imploded using shaped charges (" Fat Man "), and an alternative design for a thin, less heavy uranium bomb triggered in a shotgun or gun-type design (" Little Boy "). The bomb development culminates in a detonation in south-central New Mexico at the Trinity Site in the Alamogordo Desert (05:29:45 on July 16, 1945), where everyone watched in awe at the spectacle of the first mushroom cloud with roaring winds, even miles away. Both bombs, Fat Man and Little Boy, were successful, ushering in the Atomic Age.