O Programa de Desenvolvimento de Submarinos (Prosub) e o Programa Nuclear da Marinha (PNM), em conjunto, constituem, a um so tempo, uma relevante politica publica de defesa, destinada a criar instrumentos criveis de dissuasao e um extraordinario desafio gerencial, industrial e tecnologico para o pais. Sua implementacao exigiu mais de 30 anos de persistencia de varios atores, que atuaram em periodos em que o Brasil funcionou sob instituicoes muito distintas e demandara a alocacao de expressivos recursos publicos durante varias decadas. Trata-se, portanto, de uma politica que merece ser analisada com muita atencao. Para tal, foi utilizado o arcabouco teorico dos fluxos multiplos de Kingdon, com a modificacao sugerida por Nowlin, que se mostrou mais adequada para analise de politicas publicas de defesa. Palavras-chave: Defesa; Logistica de defesa; Submarino. ____________________________________________________________________________________ ABSTRACT PROSUB: A PUBLIC DEFENSE POLICY AIMED TO CREATE DETERRENCE INSTRUMENTS The Submarine Development Program (Prosub) and the Brazilan Navy Nuclear Program (PNM) together constitute at once a relevant public defense policy, aimed at creating credible deterrence instruments, and an extraordinary managerial, industrial and technological challenge for the Country. Its implementation consumed large amounts of resources and required more than 30 years of persistent efforts by several actors, who acted in periods when Brazil operated under very different institutions. Additionally, it will demand the allocation of significant amounts of public resources over several decades. Therefore, this policy deserves careful consideration. To this end, Kingdon’s theoretical multiple flows framework was used, with modifications suggested by other authors. Keywords: Defense Public Policy. Defense Logistics. Nuclear Submarine.