Project Islero
Spanish nuclear weapons program (1963–1987)
Project Islero was an attempted Spanish nuclear program. Named after Islero, the bull which felled the famous bullfighter Manolete, the program was created by Generals Agustín Muñoz Grandes and Guillermo Velarde in 1963. Although Spain possessed the second largest uranium deposits in the world at the time, it was not until the Palomares Incident of 1966 that Spain would focus on plutonium-239 implosion-type designs. Yet, in 1966, Franco paused the military research, shifting efforts to nuclear reactor construction and plutonium production. However, the program was resumed in 1971, with help from France to refine the material and fund the nuclear facilities.
The public source identifies “Project Islero” as spanish nuclear weapons program (1963–1987). This brief keeps that definition visible, then builds a research path around Project, Islero and Spanish.
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A short description can identify a subject without explaining its stakes. For “Project Islero”, the useful work is to connect “spanish nuclear weapons program (1963–1987)” to the records capable of establishing context and consequence.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated May 23, 2026. The first chronological checks are 1963, 1966 and 1971.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Project Islero” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.