sub missing

[Lucas]

"The Argentine navy lost contact with the ARA San Juan shortly after the vessel's captain reported a failure in the battery system while the sub was submerged off Argentina's South Atlantic coast, the military said." 

you would think right after this they would be making sure they knew the exact location and rescue teams sent within hours  , idk what am i missing ? 

http://www.cnn.com/2017/11/23/americas/a...index.html