Transcript for Rescue crews face false leads in search for missing submarine

Now to that desperate search for that submarine that disappeared six days ago with 44 members on board. Linzie Janis is in Argentina as rescue crews race against time and, Linzie, the Navy now says what they thought were leads may have been false hope. Reporter: Good morning, robin. That's right. An Argentine Navy rescue ship said they detected sounds coming from under the water and that raised hopes here at the port where the "Ara San Juan" is based but the Navy determining they were not coming from the missing submarine. As you can see it is finally a beautiful day and we spoke with naval command and conditions out in the search area are much better today. Have a look at the treacherous conditions they've been dealing with several days. 25-foot seas, hampering this search. On board 44 crew members including Argentina's first ever female submarine officer, Ileana MARIA saying her dream is become the first submarine commander. The "Ara San Juan" has not been heard from in six days since it reported an electrical fault. The race is on to get to these submariners in case they are running out of oxygen. Race against time. All right, Linzie, thank you.

This transcript has been automatically generated and may not be 100% accurate.