Second Brazilian Riachuelo-class submarine conducts pre-service testing
The Humaitá is the second of four diesel-electric boats on order for the Brazilian Navy. (Photo: Agência Marinha de Notícias)
The second of four PROSUB conventional attack submarines has completed diving trials ahead of service entry with the Brazilian Navy later this year.
During March, Brazil’s PROSUB SSK S-41 Humaitá carried out dynamic submersion and depth trials off the coast of Rio de Janeiro.
The Humaitá is the second of four diesel-electric boats on order for the Brazilian Navy and the acceptance tests at sea will release it for service entry. The first-in-class Riachuelo, was commissioned in September 2022.
The trials evaluate not only the submarine’s ability to dive safely, but evaluate the level of readiness of the crew.
Related Articles
PROSUB programme passes new milestone
Defence: what to expect from the next Brazilian president
India enlists French help to install AIP in Scorpene submarines
The programme schedule envisages releasing S-41 for operational service in the second half of this year.
The four new Riachuelo-class SSKs are based on the Naval Group Scorpene design.
The PROSUB programme includes the establishment of a new naval base and submarine manufacturing facility at Itagui in Sepetiba Bay south of Rio de Janeiro, the build of four SSKs and technology transfer to allow the construction of Brazil’s first nuclear-powered attack submarine.
Related Programmes in Defence Insight
Related Equipment in Defence Insight
More from Naval Warfare
-
![Canada boosts Arctic presence as CCGS Donjek prepares for sea trials this year]()
Canada boosts Arctic presence as CCGS Donjek prepares for sea trials this year
CCGS Donjek is currently being prepared to start testing and be handed over to the Canadian Coast Guard in the second half of 2026.
-
![US Navy to accelerate the replenishment of SM-6 stocks as demand continues to surge]()
US Navy to accelerate the replenishment of SM-6 stocks as demand continues to surge
The Naval Sea Systems Command exercised a US$335 million modification to a contract with RTX Raytheon to support increasing the production of Standard Missiles 6 by 2030. Shephard spoke with the company president about how the company has scaled to meet demand.
-
![How the Hormuz mine threat exposes potential Baltic MCM shortfalls]()
How the Hormuz mine threat exposes potential Baltic MCM shortfalls
Ageing Baltic vessels and an absence of active minehunting vessel programmes in the region have been put under the spotlight in the recent conflict.
-
![“We must end the mentality of ever larger platforms”: Why USVs are scaling]()
“We must end the mentality of ever larger platforms”: Why USVs are scaling
Multiple USV programme milestones announced last week, aligned with a reinforcement of the Royal Navy’s vision for a hybrid fleet, point to innovation-led ambition but also to a structural calculation with resource ceilings that neither London nor Washington can ignore.
