aviation correspondent richard quest, and inspector general mary schiavo who currently represents families of disasters. and the question we have been asking all along and certainly must be asking about the elts, the locater transmitters which are supposed to come off when it comes in contact with the water. >> well, they're not the most reliable for man or beast, there is a 20% failure rate off that particular instrument. then you have the question of where this took place. the most remote place on earth, way in the depths of the indian ocean. then you factor into it how did the plane actually land or go into the water. was it activated sufficiently? finally you have the question, if the machines work deep, deep