Noise heard hours after sub's last contact: Argentine navy

Argentina's navy said today it is investigating a noise detected in the South Atlantic hours after it last communicated with a missing submarine and its 44-member crew.
Navy spokesman Enrique Balbi told reporters the "hydro- acoustic anomaly" was detected in the ocean almost three hours after the last communication with the San Juan on November 15, 48 kilometres north of its last known position.
Asked if the noise could have been an explosion, the spokesman declined to speculate.
"It is a noise, and it has to be corroborated and looked into."
"It's not something we would leave" unaddressed, he added, as hopes for the crew's survival looked increasingly fraught.

"We are in a very dangerous situation, and one that is getting worse," Balbi continued.

The ARA San Juan would have had enough oxygen for its crew to survive underwater in the South Atlantic for seven days since its last contact, according to officials. At 0730 GMT Wednesday, that time had elapsed.
Despite the mechanical problems it reported during its last contact last Wednesday, the crew could survive indefinitely if the sub retained the ability to rise to the surface to "snort" or replenish its air.
The 34-year-old German-built diesel-electric submarine that was refitted between 2007 and 2014 had flagged a breakdown and said it was diverting to the navy base at Mar del Plata, where most of the crew members live.