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.
More from Naval Warfare
-
![Kongsberg contracted for Dutch and Belgian frigate propellers and drive shafts]()
Kongsberg contracted for Dutch and Belgian frigate propellers and drive shafts
In July 2023, Damen and Thales signed contracts to design, build and deliver four new anti-submarine warfare (ASW) frigates for Belgium and the Netherlands.
-
![Leonardo fires up small calibre naval gun development as Italy nears first Lionfish X-Gun handover]()
Leonardo fires up small calibre naval gun development as Italy nears first Lionfish X-Gun handover
Alongside progress on its Lionfish contracts, Leonardo emphasised its shift in focus from traditional larger calibre systems toward smaller calibre solutions, epitomised by the X-Gun’s inception in 2017.
-
![SEA to trial sonar software for UK Royal Navy]()
SEA to trial sonar software for UK Royal Navy
The UK Royal Navy’s anti-submarine warfare Spearhead programme, run by the service’s Develop Directorate, has been investigating future and existing technologies with a particular focus on the USV arena.
-
![Australia’s new frigate options: No easy choices as pressure mounts on DoD]()
Australia’s new frigate options: No easy choices as pressure mounts on DoD
A new class of General Purpose ‘Tier 2’ frigate will replace the Royal Australian Navy’s (RAN’s) Anzac-class frigates, but the selected design options appear to have major issues in terms of compatibility and availability for the future fleet.
-
![Royal Navy welcomes mine-hunting mothership]()
Royal Navy welcomes mine-hunting mothership
RFA Stirling Castle, a 6,000-tonne vessel, will start operations later this year.
-
![Norway’s aim to purchase new frigates may impact Royal Navy’s own fleet production]()
Norway’s aim to purchase new frigates may impact Royal Navy’s own fleet production
The UK Ministry of Defence (MoD) has only so far confirmed that discussions have been taking place with BAE Systems, but a decision has yet to be made, according to The Telegraph.
