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
You may also like
More from Naval Warfare
-
![Suppliers await next step in Australia’s mine warfare transition]()
Suppliers await next step in Australia’s mine warfare transition
Australia’s mine countermeasure capability remains in flux as the Huon-class nears retirement, but accelerated investment in autonomous systems is opening a path for industry.
-
![Can the US Navy ask Indo-Pacific allies to do more while training with them less?]()
Can the US Navy ask Indo-Pacific allies to do more while training with them less?
As the Iran War draws US ships and marine corps units away from the Indo-Pacific, curtailed exercises and a temporary carrier gap are exposing tensions between Washington’s demand for more self-reliant allies and the joint training needed to realise that ambition.
-
![How could Rheinmetall’s GMF 140 fit with ongoing programmes in North America?]()
How could Rheinmetall’s GMF 140 fit with ongoing programmes in North America?
With Canada committed to its River-class replacement and the USN pursuing a lower-cost frigate, Rheinmetall will need to demonstrate where the GMF 140 can fill a capability gap in the North American fleet.
-
![South Korea, Japan and Turkey vie for US shipbuilding access in future frigate contest]()
South Korea, Japan and Turkey vie for US shipbuilding access in future frigate contest
Washington’s search for a foreign-built frigate could hand South Korea, Japan and Turkey a larger prize than a double-hull order: a foothold inside the US shipbuilding industrial base.
-
![Japan’s FY2027 budget bets on stand-off systems to offset demographic decline]()
Japan’s FY2027 budget bets on stand-off systems to offset demographic decline
Japan’s FY2027 defence budget backs stand-off strike, a 17-aircraft MQ-9B buy and a declared bid to lead the world in uncrewed maritime assets, alongside new frigates, submarines and support ships.
