data recorders, they are key. they've got some time they can be underwater. there's a long time the data can stay underwater. if they know where the wreckage is they should be able to find those. one of those recorders will have the voices from the cockpit we suspect. we'll know what was happening with those pilots. the rest will be the avionics. this is the next key. aside from returning these bodies as the family so desperately needs, it's the data we need isn't it gentlemen? >> it is and all that in addition to the cockpit voice recorder recording air traffic control negotiation reporting the cockpit voices it will record sounds. switches being hit, potentially heavy rain hitting the wind screen of the airplane. so there's a lot of things then it will coordinate with the digital flight data recorder with a program that david is familiar with. >> and that will be the key to unlock the investigation at that point. we have to find the wreckage find the black boxes, return those bodies of course, and