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Etiane! Does any one know the type of torpedo carried on board the two TR1700 class Argentinian submarines. The sistership: On 15 June 2014, Santa Cruz ran aground in an accident near Buenos Aires exposing its rotted out hull. She was being towed to Tandanor shipyard for maintenance, and was unlocked without damage.
On September 2016, Santa Cruz started a renovation and life extension program at the Tandanor shipyard in Buenos Aires, Argentina. The work will include changing all 960 batteries, periscope and snorkel maintenance, revision of engines, and overall system upgrades. She had had the same midlife refit as Ara San Juan ca. 1999-2001.... My first guess(explosion??) would be a Kursk type outdated ordinance failure; but I can find no info on torpedo type/propulsion system ordinance failure.

San Juan like her sister arrived too late for the Falklands War in 1982. In fact, the construction program hindered the war effort by sending the most experienced Argentine submariners to Europe to assist the TR-1700’s development.

The inexperienced crews of the World War II-era submarines ARA San Luis and ARA Santa Fe fought in the war. However, the British sank Santa Fe at South Georgia. San Luis tried in vain to sink British warships but was unsuccessful due to crew mishaps and technical problems with her wire-guided torpedoes. “These factors point to a ship [San Luis] that was operationally unready to fight a war,” U.S. Navy Lt. Cmdr. Clinton Cragg wrote in a 1991 report for the Naval War College.
San Juan entered service in November 1985. Cragg went on to describe the TR-1700 as “impressive,” noting its 12,000-nautical-mile range and 890-foot maximum depth as representing a “formidable ocean going threat.” During the mid-1980s, U.S. government literature referred to the TR-1700 as the most advanced non-nuclear submarine anywhere in the world.
The San Jorge Gulf off Argentina’s eastern gulf, near San Juan’s last known location, is shallower than her maximum operating depth.
“Numerous overt (and possibly) covert attempts were made to gather intelligence on this generation submarine while it was on sea trials and in transit to Argentina,” Cragg noted.
The sinking of the cruiser ARA General Belgrano during the war by the British submarine HMS Conqueror was another wake-up call for the Argentine navy. Massive inflation — already a problem before the conflict — continued, and anti-military sentiment after the defeat in the Falklands helped pummel the defense budget.
The TR-1700 program was a rare survivor of this contraction, a testament to the importance of submarines in Argentina’s doctrine at the time, although four more planned TR-1700s were scrapped during construction.
“The submarine, viewed as a luxury item in the seventies, was now considered as an essential element in Argentina’s security,” Cragg added. “The submarine came to be viewed as a cost effective avenue to carry out the mission of the state.”
Argentina has continued investing resources in its submarine fleet — retrofitting San Juan from 2008 to 2013 — as its surface fleet declined and experienced several serious incidents and mishaps.

...and we think our own collision-prone Navy is bad.... A leading cause of deaths in any navy appears to be budget constraints.