According to Poder Naval, the submarine Riachuelo (S40), the first of four S-BR (modified Scorpène class) diesel-electric attack submarines of the Submarine Development Program (Prosub), started her sea trials on September 25, 2019.

Sea trials are scheduled to last until the first half of 2020, while boat’s commissioning is scheduled for October 2020.

Riachuelo (S40) was launched at a ceremony held at the Itaguaí Naval Complex on December 14, 2018.

A 533-mm heavy F21 torpedo from the Naval Group and a test Exocet SM39 Block 2 Mod 2 anti-ship missile are expected to be launched during the Riachuelo sea trials, the Navy said.

The Riachuelo will be followed by three more submarines: the Humaitá (S41), scheduled for launch in 2020, the Tonelero (S42) in 2021 and the Angostura (S43) in 2022.