The ARA San Juan submarine disappeared 430km (270 miles) off the Argentine coast on 15 November 2017.
The navy stopped its rescue mission two weeks after the sub's disappearance.
However, a year and a day after it went missing, officials announced it had been found 800 metres down in the Atlantic Ocean.
According to a tweet from the Argentine navy, the ARA San Juan had been positively identified under the water by a US company.
The navy had earlier shared a picture from the seabed, suggesting a 60m (197ft)-long object might be the missing submarine.
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