southeast consultants. also our cnn aviation analyst, former ntsb managing director peter goelz. peter, is there a logical explanation? i can understand one or two, but all four of them not working at all? >> it's unusual, but it's not out of the question. they're not accident proof. they're not like the flight data recorder or the vice recorder. they're not armor. it's not uncommon they'll lose their antenna, they'll lose their ability to transmit. in this case, where you had four of them, two built into the plane and two added later, i think on one of the life rafts, there's a -- it's unusual. >> because this adds to the suspicion that the family members have. they still obviously are clinging to the hope that their loved ones may be alive. maybe the plane landed some place and is being hidden for whatever reason. the fact that none of these transmitters, none of these beacons worked, is giving them