Four Cold War accidents involving American nuclear weapons form the spine of this two-episode documentary: a B-52 crash near Mount Kologet in British Columbia, the Goldsboro incident in North Carolina where a hydrogen bomb's safety switch nearly failed, the 1966 Palomares crash off the Spanish coast that scattered plutonium over a fishing village, and the 1968 Thule crash in Greenland that contaminated the Arctic ice. Historians, geopolitical specialists and atomic weapons experts walk through declassified files to explain how each accident unfolded and how close it came to catastrophe. The first episode stays on American soil, the second moves to European sites, tracing the cleanup operations, the cover stories governments told at the time, and the diplomatic fallout with allies who only learned the full truth decades later. Archival footage and period photographs anchor the interviews, which focus on what the classified record actually shows rather than speculation. The film's case is that these were not isolated mishaps but symptoms of a nuclear arsenal built and moved faster than anyone could fully control.