The Argentine navy says an event consistent with an explosion was recorded near where a submarine disappeared last week with 44 crew on board.
An “abnormal, singular, short, violent, non-nuclear event” had been detected in the south Atlantic, a spokesman said.
The information was relayed via Argentina’s ambassador in Austria, Captain Enrique Balbi said.
It follows a report of a loud noise in the same area.
The ARA San Juan disappeared last Wednesday. More than a dozen