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Input: "The most critical situation would be that we are in the sixth day of oxygen " the navy's spokesman  Capt.  Enrique Balbi   said at a news conference. "Obviously that is worrisome. Each time we are entering little by little a critical period."
 Balbi  agreed. "The seven days is not dogmatic. It varies according to the circumstances."
Earlier  the navy said that white flares spotted by a U.S. aircraft involved in the search were unlikely to have been from the sub. The San Juan carried red and green flares   Balbi  told reporters.
 He  also said a life raft that was found in the search area early Tuesday did belong to the submarine and probably fell off another vessel.
"We're evaluating where the flares came from. For now  based on the color  they don't belong to the submarine  " Balbi  said. "It's quite common that ships pass by that area and also common that with the waves and the rocking  they can lose a raft."
More than a dozen vessels and aircraft from several countries have joined in the search. Weather conditions that have hindered the search were expected to improve  helping search teams comb a wider area   Balbi  said.

Widening search finds no sign of missing Argentine submarine