Itaguai Shipyard Launches Brazilian Navy’s Second Riachuelo-Class Submarine Humaitá

The Brazilian Navy’s second Modified Scorpene-class (Riachuelo-class, S-BR) diesel-electric submarine, Humaitá (S41), has been launched at the Itaguaí Construções Navais (ICN) in Itaguaí, Rio de Janeiro on Dec. 11.

During the ceremony, the submarine was christened by its sponsor, Ms. Adelaide Azevedo, wife of the Minister of Defense Fernando Azevedo e Silva.

In 2009, Brazil purchased four enlarged Scorpènes (S-BR, SBR) from Fren shipbuilding major Naval Group for US$9.9 billion for its Navy (Marinha do Brasil) with a technology transfer agreement and a second agreement to develop a French/Brazilian nuclear-powered submarine (SNBR) as part of the submarine development programme (PROSUB). The nuclear-powered submarine, named Álvaro Alberto (SN-10), is under construction and is based on the enlarged Scorpène class which would make it similar in concept to the French Navy Rubis-class submarine.

With a length of 71.62 m and a surface displacement of 1,870 tonnes, the S-BRs are designed for a full range of roles, including anti-surface (ASuW) and anti-submarine warfare (ASW) missions, special operations, and intelligence-gathering. The S-BR variant is not fitted with an air-independent propulsion (AIP).

The ships feature six 533 mm tubes firing either Naval Group F21 torpedoes or MBDA Exocet SM39 Block 2 Mod 2 missiles. Naval Group CANTO decoys launched from two Naval Group Contralto-S countermeasures launchers provide the S-BRs with anti-torpedo capability.

The other two Scorpene submarines –Tonelero (S42), and Angostura (S43) – are currently at different stages of construction.

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