Humaytá was a modified built in Italy for the Brazilian Navy

Brazilian Navy

The Brazilian Navy is a branch of the Brazilian Armed Forces responsible for conducting naval operations. It is the largest navy in Latin America...

. The submarine was laid down by Odero-Terni-Orlando at La Spezia

La Spezia

La Spezia , at the head of the Gulf of La Spezia in the Liguria region of northern Italy, is the capital city of the province of La Spezia. Located between Genoa and Pisa on the Ligurian Sea, it is one of the main Italian military and commercial harbours and hosts one of Italy's biggest military...

 on 19 November 1925, launched on 11 June 1927, and handed over to the Brazilian Navy on 11 June 1929. Proceeds from the sale of the to the Mexican Navy

Mexican Navy

The Mexican Navy is the naval branch of the Mexican military responsible for conducting naval operations. Its stated mission is "to use the naval force of the federation for the exterior defense, and to help with internal order". The Navy consists of about 56,000 men and women plus reserves, over...

 provided funds for Humaytás purchase. Humaytá was commissioned into the Brazilian Navy on 20 July 1929. She remained in Brazilian service through World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

and was decommissioned on 25 November 1950.