Over six months, more than two dozen journalists and researchers pored over 6,700 pages of federal government documents, many of which had been either newly-declassified or never before reviewed.

We consulted experts to analyze the reports anew, to see if the environmental and radioactivity testing done decades ago could be seen and understood in a different, modern light.

In addition to the full report, you can explore the the history of the St. Louis nuclear waste site in an interactive map and read some of the key findings of our joint report. If you’re a journalist interested in applying our lessons to your own reporting project, or just want to know more about the process, there’s also a guide to how our ‘Atomic Fallout’ reporting came together.