CNN CNN Newsroom April 12, 2014 14:05:00
Been very, very little in terms of concrete developments in this search operation. >> so, matthew, thinking of that, have you heard any officials give any sort of timeframe as to when they may deploy some of these underwater drones? >> reporter: they're not giving an absolute timeframe about that. but what they're doing is this. they're saying, look, while there's a chance that they can still detect any electronic signals from the black box -- the beacons on top of the black box flight recorders, the pings, they're going to continue trying to do that. because when they listen to these pings, i...