"Despite all the effort that has been carried out, we haven't been able to find the San Juan submarine", Balbi told reporters. "We will not speculate beyond the facts as we know them".
Reports of a sound detected underwater near the submarine's last known position off Argentina's southern coast in the Atlantic last week suggest it may have imploded at depth.
Also heading for Argentina is the Russian oceanographic research ship Yantar, and according to Argentine navy spokesperson Enrique Balbi its arrival in the search area was expected "by the end of the week".
Argentina's navy insisted the ARA San Juan submarine was in good condition before it set off on its mission.
The German-built diesel-electric submarine set off on November 8 from the southernmost port of Ushuaia en route to Mar del Plata.
After November 17, when an Argentine notification on the launch of a search and rescue operation appeared at the homepage of the International Submarine Escape and Rescue Liaison Office [ISMERLO], "this country started getting a huge number of proposals from different countries for various types of assistance", Balbi said.
"The problem with being the loved one of someone who is missing is that the mourning process can not start, because they are still out there somewhere", local psychologist Guillermo Bruchstein said in a television interview Saturday.
Sailors continue to search for ARA San Juan submarine. "They are gone, but are not 'dead'".
"I'm here to guarantee you that we will carry on with the search, especially now that we have the support of all the global community".
Some family members accused the navy of putting their loved ones at unnecessary risk by sending them out in a more than 30-year-old vessel that they suspected was not properly maintained, an accusation the navy has denied.
Opposition politicians blamed the loss on a reduction in funding for the armed forces, whose budget has declined since the fall of a military dictatorship in the 1980s.
"Until we have the complete information, we do not have to look for the guilty, to look for those responsible".