Story highlights Analysis shows noises were not possible distress signal

"Worst-case scenario" is sub had only 2 days of air, navy says

(CNN) Sounds that were detected during the search for a missing Argentine navy submarine did not come from the vessel, the navy said late Monday.

Noises that had been detected earlier Monday were thought to be a possible distress signal from the crew of the sub.

A US Navy P-8A Poseidon aircraft was brought to the area to record an acoustic footprint of the sound, but analysis of the file determined the noises were not from the missing vessel, Argentine navy spokesman Enrique Balbi said from Buenos Aires.

The noises were possibly from the ocean or marine life, Balbi said.

Two vessels searching for the sub had heard a "noise" at a depth of about 656 feet, Balbi said earlier Monday. The location of the noise coincided with the route the submarine would have taken on the way to its home port in Mar del Plata.

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