turn off the transponder and the acars system. so i think it might advance it a little bit but you can't tell yet. >> one thing that becomes clear here, clearly this is intelligence, an evolving intelligence operation and they are working with imperfect data and they are adjusting as we go. and to explain to our viewer who is have to be frustrated with the constant false alarms. >> and they've got the 30-day deadline with the pingers expiring if they haven't already. they feel pressure to get one last search while the pingers are going. if they find some wreckage, they are going to drop a device into the ocean and see if they can pick up something. >> peter goelz, miles o'brien, thank you. defending the mental state of the pilots of flight 370. malaysian airlines said they both underwent regular, psychological evaluations. but did they miss something? and later, our own reporter