President Michel Temer and his right-wing successor, President-elect Jair Bolsonaro, both pressed the button that lowered into the sea the 1,700-ton submarine named Riachuelo at a Rio de Janeiro naval base. Temer's wife, Marcela, had christened the vessel, by smashing a champagne bottle against its hull. The submarines being built by the Brazilian Navy in partnership with France's defense company Naval Group, formerly known as DCNS, are a modified version of the Scorpene class diesel-powered submarine.