An Argentinian military submarine with 44 crew members on board has gone missing at sea.
Ships and aircraft have been scrambled to search for the vessel - named ARA San Juan - in the southern Argentine Sea.
Sky News Defence Correspondent Alistair Bunkall said the British Government has offered to assist, with an A C130 Hercules stationed in the Falklands Islands on standby if required.
It has been two days since ARA San Juan provided its last location and navy spokesman Enrique Balbi said heavy winds and high waves were complicating efforts.
"Detection has been difficult despite the quantity of boats and aircraft" involved in the search, Mr Balbi said.
He said the vessel may be suffering from a communications error.
"We are investigating the reasons for the lack of communication. If there was a communication problem, the boat would have to come to the surface."
Mr Balbi said the submarine, which left the southern city of Ushuaia for Mar del Plata, more than 1,800 miles away, has food supply for several days and is likely to continue its journey despite the problem.
According to national Argentinian newspaper La Nacion, the 66-metre long, diesel-electric vessel was subjected to complex repair and engineering work in 2008, which the country's navy believed would extend its life by 30 years.
It was built in Germany in 1985 and arrived in Argentina a year later.
Argentina's President Mauricio Macri said the government was in contact with the crew's families.
"We share their concern and that of all Argentines," he wrote on Twitter.
"We are committed to using all national and international resources necessary to find the ARA San Juan submarine as soon as possible."
Source : https://uk.news.yahoo.com/argentinian-military-submarine-ara-san-juan-missing-sea-154500602.html636