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An “abnormal” and “violent” incident “consistent with an explosion” has been detected in the South Atlantic Ocean, according to Argentina’s navy. It occurred near the last known location of a missing submarine carrying 44 people.

It comes as a dozen countries are conducting a search and rescue mission for the ARA San Juan, which disappeared on November 15. It was believed that that those on board could have still been alive, but running out of oxygen.

Search teams have been covering an area of some 185,000 square miles (480,000 square kilometers), which is roughly the size of Spain.