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The Russian military has sent its top-notch research vessel, equipped with submersible drones, to assist the search for the missing Argentinian submarine, the Defense Ministry says.

The ‘Yantar’ has been sent to the search area, where ARA ‘San Juan’ with 44 crewmembers on board is believed to be stranded, the ministry reported on Thursday. On Wednesday, Russian President Vladimir Putin offered help in finding the submarine, which has been missing since November 15.

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The submersibles on the ‘Yantar’ are capable of diving up to 6,000 meters and are equipped with manipulators and other devices for complex underwater operations. The ship itself has advanced detectors, which may help to determine the precise location of the submarine. The surveillance capabilities have gained the ‘Yantar’ the label of ‘spy ship’ in the Western media.

The Russian military has also sent an airborne team of maritime rescue operation specialists to assist in the search. Among other things the team is equipped with a submersible called Pantera Plus.

The Russian intervention comes at a moment when time is running out for the Argentine submariners, who may still be alive but in danger of running out of oxygen in a stranded vessel. So far the location of the missing sub has not been pinpointed, but rescuers have some leads to investigate.

One of them is a “hydro-acoustic anomaly” detected a week ago in the region the ‘San Juan’ went missing, Argentinian Navy spokesman Enrique Balbi told reporters on Wednesday. The phenomenon occurred at 30 nautical miles north of the last position from where the submarine had communicated.

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The ‘Yantar’ has been part of Russia’s Northern Fleet since being commissioned in 2015. She is a 5,320-ton special-purpose military vessel officially dubbed an “oceanographic research ship” and reportedly equipped with Konsul-class submersible. Her presence off the US coast the same year sparked concerns in Washington over her suspected ability to sabotage underwater cables.