The Brazilian Navy accepted the delivery of its third Scorpène-class submarine, Tonelero (S42), at the Itaguai naval base in the state of Rio de Janeiro on 26 November 2025.
The event marked a further step in Brazil’s Submarine Development Programme (Prosub), which is being carried out with the technical support of French defence company Naval Group and local shipbuilder Itaguaí Construções Navais (ICN).
In addition to the delivery of Tonelero, the fourth Scorpène-class submarine, Almirante Karam (S43), was launched on the same day.
Naval Group has provided ongoing assistance to Brazil through a technology transfer agreement that covers the construction of four Scorpène-class submarines at ICN.
The programme began with the commissioning of Riachuelo (S40), the first submarine in the series, in September 2022.
The second vessel, Humaitá (S41), was commissioned in January 2024.
Tonelero, built entirely in Brazil, was launched at the Itaguaí Naval base in March 2024.
As part of the technology transfer arrangement, Naval Group has supplied key equipment and technical support to ICN.
ICN shipyard teams also received training in France on submarine construction methods including specific work for welders, metal formers, plumbers, and electricians.
According to Naval Group, this approach has ensured that ICN can manage all phases of submarine production from the initial forming of metal plates through to system commissioning and testing onboard each vessel.
In parallel with its involvement in Prosub, Naval Group has incorporated several local suppliers into its supply chain.
These companies can now participate not only in Prosub, but also in future submarine construction and support opportunities.
The inclusion of local suppliers is intended to expand their access to new markets by applying skills gained from participation in the programme.
Naval Group chairman and CEO Pierre Éric Pommellet said: "We are honoured to contribute to strengthening Brazil’s maritime sovereignty. More than delivering submarines, our mission is to build, together with Brazil, a long-term technological and industrial legacy.”
The Scorpène-class submarines produced for Brazil are conventional diesel-electric attack submarines that have been adapted by Naval Group for specific operational requirements outlined by the Brazilian Navy.
Each of the vessels is designed for roles such as anti-surface warfare, anti-submarine warfare, and special operations.
Brazilian Scorpene vessels have a surface displacement of 1,870 tonnes and an overall length of 72 metres (m).
Their maximum diving depth is specified as 300m, while their autonomy is 45 days.
Each Scorpène-class submarine has a submerged speed capability of 20,000 knots and can be operational for up to 240 days per year.
The armament configuration includes six weapon tubes which can accommodate a total payload of up to 18 weapons.
