Almirante Karam (S43)[9] —previously known as Angostura— is the fourth unit of the Riachuelo-class submarines built for the Brazilian Navy by ICN in Itaguaí, and DCNS, a modified design of the original French Scorpène class The Brazilian boats are larger in length, tonnage and cargo capacity compared to the original French project.

[10] In 2008, Brazil purchased four enlarged Scorpènes for USD 10 billion with a total technology transfer agreement and a second agreement to develop the first Brazilian nuclear-powered submarine, Álvaro Alberto.

The hull of Riachuelo was laid down at Cherbourg, France on 27 May 2010 and it was jumboized at the Brazilian Navy Shipyard in Itaguaí in late 2012.

[9] This Brazilian military article is a stub.

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