br On the same day, the Brazilian Navy marked two major milestones in the Submarine Development Program (PROSUB): the christening of the S43 Almirante Karam and the commissioning of the S42 Tonelero, both members of the Riachuelo class.br According to the Brazilian Navy, the delivery of a new submarine and the progress in building another are the direct result of a broad technological cooperation program with European partners, which has enabled Brazil to develop high-technology submarines with increasing industrial independence.br S43: first of its class fully built in Brazilbr The S43 Almirante Karam is the first Riachuelo-class submarine built entirely in Brazil by the shipyard Itaguaí Construções Navais (ICN). The new vessel will significantly enhance surveillance, control and defense capabilities along Brazil’s vast coastline, incorporating modern systems essential to naval operations.