President Mauricio Macri said the Russian leader, Vladimir Putin, had phoned him to offer to deploy a survey vessel and crew with experience of similar operations.

More than a dozen countries, including the US, are taking part in the search.

The ARA San Juan vanished after it reported an electric breakdown.

It last made contact with naval officers on land last Wednesday.

A navy spokesman, Captain Enrique Balbi, said the search had now entered “a critical phase,” amid fears that oxygen supplies may be running low.

He later told Argentine journalists that the Navy was investigating reports of a loud noise detected in the area a few hours after the ARA San Juan went missing.

He described it as a “hydro-acoustic anomaly” and refused to confirm whether there had been an explosion.

The whole country has been following the news closely, hoping that the sub is located before it runs out of oxygen.

Brazil, Chile, Colombia, France, Germany, Peru, South Africa, Uruguay and the UK are among the countries that have sent either ships or planes to help with the search.

The US Navy has deployed two underwater vehicles which use sonar to create images of the sea floor.

The ARA San Juan was returning from a routine mission to Ushuaia, near the southern-most tip of South America, when it reported an “electrical breakdown”.

According to naval commander Gabriel Galeazzi, the submarine surfaced and reported the breakdown, which Capt Galeazzi described as a “short circuit” in the sub’s batteries.

The sub was ordered to cut its mission short and return to the naval base in Mar del Plata immediately.

According to navy spokesman Enrique Balbi, the captain of the ARA San Juan contacted the naval base once more after reporting the problem.

In the message, he reportedly said that the problem had been adequately fixed and that the sub would submerge and proceed towards Mar del Plata naval base.

The last contact was made at 07:30 local time (10:30 GMT) on Wednesday 15 November. It is not known what happened to the sub after that contact.

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Source: BBC

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