In 1966 two American airplanes collided over Palomares, Spain and as a consequence, four H-bombs fell to earth. Two of them explode their conventional charge and due to the strong wind radioactive material is scattered over the region. An intensive search is stared to find the fourth bomb. At the same time, decontamination process of the zone is starting and the residual contamination of persons and environment begins to be checked and also the Proyector Indalo, still running 41 years later.