The U.S. government secretly allowed radiation from a damaged reactor to be released into air over the San Fernando and Simi valleys in the wake of a major nuclear meltdown in Southern California more than 50 years ago - fallout that nearby residents contend continues to cause serious health consequences and, in some cases, death. Area Four," which is part of the once-secret Santa Susana Field Lab, [was] founded in 1947 to test experimental nuclear reactors and rocket systems. In 1959, Area Four was the site of one of the worst nuclear accidents in U.S. history. But the federal government still hasn't told the public that radiation was released into the atmosphere as a result of the partial nuclear meltdown. Now, whistleblowers ... have recounted how during and after that accident they were ordered to release dangerous radioactive gases into the air above Los Angeles and Ventura counties, often under cover of night, and how their bosses swore them to secrecy. For years starting in 1959, workers at Area Four were routinely instructed to release radioactive materials into the air above neighboring communities, through the exhaust stacks of nuclear reactors, open doors, and by burning radioactive waste. Radioactive contamination ... remains in the soil and water of Area Four and in some areas off-site. The fallout could be linked to illnesses, including cancer, among residents living nearby. In addition to the radiation, dozens of toxic chemicals, including TCE and Perchlorate, were also released ... from the 1950s to 80s.