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These four pings. the first one was longer. the second one was shorter and the last two were pretty short. they're far from each other. they're too far from each other. the tow fish only has a range of two and a half miles. these things are more like 12 miles apart. at least half of them by logic have to be false positives. i sense richard's disagreement with me here. but thing is a number of reasons why there is holes on this. i would love to hear his reasons for that, rather than just the confidence that he is sharing -- >> you're talking about commander marks, all right, richard, what did...

The fact that we're getting the detections over several miles, we ran numbers. i said no, they have to be in a much smaller area, and mother nature may be yet humble again. >> david, you heard tim say if they threw an underwater drone at it now it could take up to 600 days to do that. do you think it makes sense to continue to wait to put the underwater drone, the bluefin-21 in the water? >> you know, i have run calculations on it to point one to 24, and it is 2.5 kilometers. and if you do the math on that and figure all the pings are within the region or dome where it would be, and you do the...

Let's introduce les abin. boeing 777 captain. i think you had a question. >> yeah, commander marks, just to clarify something, do you think it is possible that the signals that you're receiving may be from both the digital flight data recorder and from the cockpit voice recorder? >> yes, so there are a couple of indications we had. first i should let you know there was a slight variation in frequency, and that can be expected. that is not something completely out of line. but on that first day we did have the same type of signal coming from two locations. the second day we couldn't quite decip...

Distance between the two? >> no, i don't have that. but it was not that great of a distance. because if we can hear it with the tpl you're only talking a couple of kilometers. so not that huge of a range. >> thank you. >> yeah, commander marks, this is david souci -- how are you? >> doing well here in the pacific. >> okay, great, what i would like to ask you when you saw the two-hour connection and you were getting the pings for two hours, and i'm hearing they were not able to be re-acquired. i am hearing you went to the south. would you not go to the north? it appears because they were so far...

>> yeah, it is a very special vehicle, if you're working at seven miles depth, you have to have ten or 12 miles of cable. so we've gotten rid of the cable. now they just dive down there with a simple fiber strand. all the way to the bottom of the ocean. it's an amazing piece of engineering. >> that is incredible. amazing technology. david gallo, thank you, david suzie as well. up next, an update from commander marks. u.s. navy, 7th fleet. and also, blistering cross examination of olympic star oscar pistorius on trial, charged with murdering his girlfriend. we'll take you inside the courtroom...