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Rated for 30 days a deadline that's already passed. >> cautious, measured optimism, right? we certainly want to reacquire it before we say yes, we have done something good here. >> reporter: caution really is the keyword here, carol, because you think about these families and all of the false hope that they have had over the past few weeks, only to have those hopes dashed. so i think the real tone that officials here are trying to take is that they want to investigate this to the fullest. but they also don't want to jump to any conclusions, they say we owe it to the families of those 239 peopl...

They had received signals from the pinger for two hours, 20 minutes and then after they had gone further, made a turn and come back, they located more pinger activity for about 13 minutes, but i asked the gentleman, was the signal identical? and he said no, it was slightly different. which means that hopefully, both of the pingers, one from the cockpit voice recorder and one from the data reporter are both from the same area, emitting signals that happened to be very slightly different but identifiable. >> interesting. so rob, a question for you. if these sounds are indeed coming from those bl...

Deep sea, called a remotely operating vehicle, r.o.b. for short. >> are you getting a signal on the r.o.b. beacons as well? >> reporter: the multimillion dollar machine is tethered to a vessel, dropped in the water by a cable and slowly, remotely lowered to the sea floor by pilots in a control room located inside the ship. >> reporter: the r.o.b. is equipped with cameras. >> a pilot monitor, and a co-pilot monitor. >> reporter: meaning an r.o.b. like this one could lay the first eyes on the wreckage of flight 370. >> it could tell you how it came apart, it could certainly tell you if certain p...