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Mission, on mission 12 actually. mission 11 has finished. search officials tell us now 90% of that focused search area has now been scanned. the news, of course, the same with all of those missions, nothing of significance, bill. >> and once they get to 100% what happens next? >> reporter: well, the search will move on, you're right. if the story is the same with the final 10%. we heard from the australian defense minister, david johnston, who said they were in contact with malaysia and china, also on the next phase, details to be announced likely next week. but we know pretty much it will inv...

Mosaic of the ocean floor at those depths. it essentially acts as an underwater drone. it can go around and take high-resolution pictures as well as a side scan sonar image of the ocean floor at these depths. what you heard angus houston say is that this the last hope of finding out what is down there. the towed pinger locator has done all that it can do. this is the next logical step and this is what they are doing with it and this does have a lot of good capability but this is something that they've got to use at this point and it looks like they are about to deploy it in the coming hours. >...

Couple hundred square miles. pretty miraculous. but that being said it is very important to shrink this down as much as possible because the bluefin-21 sonar is very slow, deliberate and methodical in searching. whereas the tpl, you simply drag it through the water and it listens to any signal that it might receive. the bluefin-21 is a side scanner and actually paints the picture of the bottom of the ocean so it is much more slow and deliberate and can't cover as much area. so even right now as small as we've gotten in this area it still is really not small enough to deploy the bluefin yet. we...