The ARA San Juan has been missing since 15 November

Some 44 people are on board the sub and the search is in a “critical phase” as the crew’s oxygen supply could be running low.

The US says an object its navy detected near to where an Argentinian submarine sent its last signal is not the missing vessel.

A P-8A Poseidon plane made the discovery but analysis later ruled the object out as being the ARA San Juan, said the American embassy.

Some 44 people are on board the missing sub and the search is in a “critical phase” as the crew’s oxygen supply could be running low.

Dozens of planes and boats are searching for the ARA San Juan, which has been missing in the South Atlantic since 15 November.

But the submarine has only seven days of oxygen and, if it has sunk or been unable to surface since it was last heard from, then it could be using the last of its supply.

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