Time, oxygen running out fast for crew of missing sub

Time, oxygen running out fast for crew of missing sub  CBS News AP Explains: the Search for Argentina's Missing Submarine  U.S. News & World Report Missing Argentine submarine may run out of oxygen soon, navy says  ABC News How searchers are trying to find Argentina's missing submarine  CNN Missing Argentine Submarine Search Intensifies despite Dim Hopes for Successful Recovery  EDM DigestFull coverage