[en] This work is a historical analysis of the project of construction of the submarine of nuclear propulsion under the optics of the people who direct or had indirectly become involved themselves with it. Geisel undertook a more autonomous type of politics. The Europe started to be the strategical region for the acquisition of nuclear technology. The only favorable country transfer nuclear technology to Brazil was the Federal Republic of Germany (FRG). The idea to construct a nuclear submarine is product of the negotiations between authorities of Brazilian politics and political, diplomatical, scientific and business authorities of the FRG. In 1978, the engineer Othon Luiz Pinheiro da Silva came back to Brazil after completing his doctorate in nuclear technology in the MIT. Commander Othon developed the idea to construct a nuclear submarine in the Brazilian Navy. Due to the events in the national and in the international scenario, Geisel decided to construct the nuclear submarine, but he opted to allow the Brazilian Navy to lead this construction. Although Geisel sketched a project of naval nuclear propulsion, it was the project elaborated by commander Othon which became the nuclear project of the Brazilian Navy. In order to prevent international attention toward this work, Geisel guided it for the subversion. This way, the idea to construct a nuclear submarine ceases to belong to the Brazilian nuclear program to become parallel nuclear program. When Figueiredo became president he kept the diversification politics of partnerships, kept the nuclear Agreement Brazil-FRG in 1975 and kept the project of construction of a nuclear reactor. Figueiredo, after observing the performance of the English nuclear submarines in the south Atlantic and to perceive the real intentions of U.S.A. towards Brazil, Figueiredo decided to support politically and financially and the project of construction of the nuclear submarine. Despite all aversion that Figueiredo had in relation to Tancredo, these authorities had joined forces so that this project survived the democratic transition. Sarney, when becoming the president of Brazil, due to the death of Tancredo, governed with the ministerial team mounted by the forms. Sarney only demonstrated being favorable and interested in the construction of the nuclear submarine after a commission verified irregularities in the Brazilian nuclear program. In 1987, Sarney says he is totally favorable to this construction. Despite of all the problems that the military troops had had to allow continuity to the nuclear project of the Navy of Brazil, this project survived to the neoliberal times. The terrorist acts on September 11^th 2001 exposed the fragilities of the defensive system of the EUA. This way, the American hegemony in the international system once again questioned, the new real enemies had been disclosed and developing countries as Brazil initiated a more determined and more independent position in the making of its external politics. The requirement for the acquisition of sensible nuclear systems occurred by means of the technology transfer and was fundamental for the world to acknowledge the economic growth of Brazil and for the developed countries to perceive the political evolution that Brazil conquered throughout its history. (author)