In 2024, the Brazilian Navy commissions the Humaitá (S41), the second Riachuelo-Class submarine, marking a milestone in its PROSUB.
This achievement follows rigorous maintenance and testing phases, underscoring Brazil’s commitment to enhancing its naval capabilities.
The Humaitá underwent RANAE maintenance, meticulously handled by Itaguaí Construções Navais (ICN) in collaboration with France’s Naval Group.
This detailed process ensures the submarine’s operational readiness.
The maintenance, lasting over two months, prepares the submarine for its final testing and commissioning.
Having completed extensive Port and Sea Acceptance Tests, Humaitá is set to begin its operational phase.
The official Armament Demonstration Ceremony, signifying the transfer to the Navy’s Operational Sector, is scheduled in January at the Itaguaí Naval Complex.

With the addition of Humaitá, the Brazilian Navy bolsters its maritime defense capabilities.
This state-of-the-art submarine will play a crucial role in patrolling Brazil’s jurisdictional waters, the Blue Amazon, and strategic South Atlantic regions.
The commissioning of the Humaitá demonstrates Brazil’s strategic investment in its naval forces.
It reflects the country’s focus on securing its maritime territory and enhancing its military presence in critical regions.
This step is vital for Brazil’s national security and its balance in regional maritime affairs.
Background
Brazil’s naval power is declining, posing a significant national security risk, as highlighted by Paulo Maia.
Historian Geoffrey Till emphasizes the importance of naval strength for economic and geopolitical influence.
Oceans, crucial for global trade, require strong maritime capabilities for national protection and economic security.
Brazil lacks extensive naval programs, unlike other major powers, leading to its diminished maritime influence.
Political focus on short-term gains has resulted in underinvestment in the Navy, which plans to retire 40% of its fleet by 2028.
As Admiral Marcos Sampaio Olsen notes, this decline threatens Brazil’s national defense.
Maia’s analysis shows Brazil’s weakened navy and maritime knowledge compromise its territorial security, stressing the importance of a strong naval force.
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