when did the argentineans first realize this sub was missing. >> eight days ago is when the sub went missing. there lies the main problem. the navy has said it has only 7 to 10 days of oxygen left. meaning time is running out for those 44 sailors who are on board. the ara san juan had left the southern tip of south america heading up the east coast towards buenos aires. there is battery failure but no specific details other than that. a dozen international airplanes and ships are participating in the search that covers over 185,000 square miles. that's an area larger than california. the u.s. is taking part sending two planes and naval research ship, sub marie rescue chamber and under water vehicles. time running out for the 44 sailors including the only