On July 13, 1959, a top secret experiment in the Californian San Fernando Valley went horribly wrong forcing a manual emergency shutdown at the Santa Susana Field Laboratory. It was the beginning of a partial nuclear meltdown, a rarity in U.S. history. Knowledge of what occurred has weighed heavily on Carolyn Tyler’s shoulders. In this moving testimony, Carolyn speaks out for the first time about the horrific health consequences that her and family members have experienced since the nuclear cover-up.