To investigate the water solubility question more thoroughly, the US Army Engineer Research and Development Laboratories (ERDL), in cooperation with the Office of Civil and Defense Mobilization, conducted studies in the summer of 1957 at the Atomic Energy Commission's Nevada test site. The studies were part of “Operation Plumbbob” and were reported by ERDL. Radioactive bomb debris was collected at the Nevada test site from the nuclear‐shot “Priscilla” on June 24, 1957. The article discusses nine solubility experiments that were conducted on the radioactive bomb debris, along with experimental results and evaluation of data.