The article narrates the forgotten efforts of Spain to develop nuclear weapons during Franco's dictatorship, focusing specifically on an incident in 1966 when a military and scientific expert, Guillermo Velarde, accidentally discovered components that could lead to the development of thermonuclear weapons. The U.S. had experienced an aerial accident that left two unexploded bombs in Palomares, and Velarde's incidental findings in the area led him to decipher the Teller-Ulam method. This discovery positioned Spain to be the fifth nation with such knowledge, yet the project was halted due to fear of international repercussions.