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The navy says this latest problem not at all unusual. but it is driving home the many challenges involved with the bluefin mission. first dive aborted because it went into waters deeper than it was programmed to go. despite interruptions the bluefin has been able to download data. so far, no evidence of the plane. >> it's absolutely confounding to me that we've not seen a single shred of concrete evidence. >> reporter: and the bluefin-21, wolf, has been down of the third run above the ocean floor for hours now. no word of further difficulties so far. we are expecting an update in the next few ...

Today. we had been told that phase of things looking for surface wreckage would be scaled down this week. no sign of that yet. they are still in the air and on the ocean looking for any wreckage. of course, none found so far. we're now in to our sixth week. >> none found so far. the data, has it been processed from the bluefin's first dive which was called off because of unexpected depth that it suddenly faced. did they find anything of note? >> good question. in fact, only in the last hour, anderson, we did get word about that. it covered about four square miles during that aborted mission. o...

The job. as you know yesterday's mission was aborted after six hours. today's dive is expected to go around the clock. there are new developments on that front, new developments, as well, with that oily substance recovered from the ocean surface and we'll also tell you about a tracking system for planes that's being rolled out over the next six years that may have changed everything about that happened to flight 370. the question is why six years from now will it be rolled out? what is taking so long. first michael holmes in perth on today's search efforts. what's the latest, michael? >> repor...

Ocean trying to do the job. as you know, the mission was aborted after nearly six hours, today, the round is expected to go for hours, there are new developments, the developments with the oily substance, and a tracking element that may change everything about what happened to flight 370. the question is, why six years later will it be rolled out? first, michael holmes from perth. what is the latest, michael? >> reporter: anderson, good morning from perth. yeah, the bluefin-21 doing its work down under, it is almost half way to the ocean floor segment, two hours to get up, 16 hours on the bott...

Debris, for surface wreckage could soon be coming to an end. he said that he thought that by this time it was becoming increasingly unlikely they would find any wreckage. though, had he to consult partners before making that final decision. >> ian williams, thanks again. let's bring in friend of the show former ntsb vefrlt greg phythe. it seems like as the search goes on it only gets harder. >> it does, and that's the big thing. we talked about this a while back, and that is there comes a point where the search effort has to have at least a re-evaluation. you know, when you look at what angus ...