The global search effort for the missing Argentine submarine ARA San Juan will benefit from calm weather this week, and just in time: the sub's supply of breathable air is likely running low, according to the Argentine Navy.
Argentina's navy said a "noise" picked up by sonar on Monday during the search did not come from the vessel.
As waves of up to 20 feet complicated the search, authorities spent Sunday analyzing data from possible satellite calls that were thought to have been made from the vessel.
Rescue teams from Argentina, the United States, Britain, Chile and Brazil have joined the search effort. Authorities have mainly been scanning the sea from the sky, as storms have made it hard for boats.
The German-built submarine was around halfway through its journey from southern Argentina to its base in the port of Mar del Plata when it disappeared on Wednesday.
He also said that a life raft that was found in the search area early Tuesday doesn't belong to the submarine and likely fell off another vessel.
Navy sailors with Undersea Rescue Command (URC) departed Miramar Saturday with a Submarine Rescue Chamber (SRC) and four aircraft, en route to where the ARA San Juan lost contact with the Argentine Navy Wednesday.
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At last contact with its naval base, the submarine had given word of a battery glitch, Capt. Gabriel Galeazzi, another spokesman, said.
The malfunction did not necessarily cause an emergency, Galeazzi added.
A man stands in front of signs in support of the 44 crew members of the ARA San Juan submarine missing at sea, placed on a fence outside the Argentine Naval Base where the submarine sailed from, in Mar del Plata, Argentina November 20, 2017.
One of the crew is Argentina's first female submarine officer, Eliana Maria Krawczyk, 35, who joined the navy in 2004 and rose to become the master-at-arms aboard the ARA San Juan. They were joined on Monday by President Mauricio Macri. Relatives of the crew members have gathered at the base to receive psychological counseling and wait for news about their loved ones.
Experts determined that the sounds, which were heard in the South Atlantic about 360 kilometers (220 miles) from the Argentine coast at a depth of about 200 meters (650 feet) hadn't come from its missing submarine but rather from some "biological" source. "It's dependent upon the last time they actually recharged their batteries, how long ago they refreshed the air, what's inside the submarine", Reed said.
Argentine submarine ARA San Juan has been missing for nearly a week now and still no sign of its whereabouts.