An international search operation has so far failed to locate the vessel. The 43 men and one woman who were aboard are believed to have died in the tragedy.
But families of the missing have pressed the government to continue the search, which has not yet been officially closed.
Some relatives claim the navy has been hiding information, and have called for a parliamentary investigation. On Friday, they protested in Mar del Plata, where the submarine was based, and Buenos Aires. Sky more