Argentina says abnormal noise heard after sub's last contact as hopes fade

Argentina's navy said Wednesday it was investigating an unusual noise detected in the South Atlantic hours after it last communicated with a missing submarine, but refused to confirm whether it indicated an explosion. 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. Navy spokesman Enrique Balbi told reporters a "hydro-acoustic anomaly" was detected in the ocean almost three hours after the last communication with the vessel on November 15, 30 miles (48 kilometers) north of its last known position.

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