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Still, authorities caution there is a long way to go. australia's top air accident investigator now saying the cost of a prolonged search could reach a quarter of a billion dollars if more private equipment is needed. miguel marquez joins us from perth with the latest. good morning, miguel. >> reporter: good morning there, carol. those discussions will be happening between all the countries involved. there is no indication that any country wants to give up this search. in fact, they are doubling down on it. the blue fin going down, we believe, for its fourth dive now to search for another 16 h...

Top of the ocean. >> do you think that's the airborne search for that? >> well, i think, you know, we already touched upon today. you got the pas, p3s and the 76ers. >> the authority has planned a visual search area totaling the center of the search area lies approximately 2200 kilometers northwest of perth, is what they're saying. but so, even the visual search area appears to be expanding. >> yeah. i mean, the crews will be searching a specific area and then eliminate that and then using modeling and information data from the people who are all over the currents and the tidal flows. that's t...

Up sound from juunderneath the water. how hopeful should we be? >> well, carol, i'm very hopeful that they are on the right place now. when you look at the accumulation of evidence and the repeated pings that all match, all the specifications we expect, i am confident they are on the right place. the fact that the p-3s now think they may have picked up something is even better news. that means the batteries are still alive. and it lets them refine the area they're going to have to look on the ocean bottom even better because it's a small area. but the smaller they get it, the faster the rest o...

They are quicker than the ships. the p-8 poseidon can travel at 500 knots and the p-3s can travel three to four miles a minute. and a jet aircraft from china, maritime surveillance. it would be sensible to deploy assets into this area first to get a feel. as we spoke about today you don't get smoke without fire. it would be unusual to find black boxes without a sign of a debris field. if you then had anything that looked suspicious or objects that we saw. 90 objects were seen today. but if there is anything that could corroborate the ships going into the area, the planes could do that. >> do y...

The australians thought they had a hit and it was a random event. the fact the chinese are calling it pulse captures my attention. i just wish we had more information and come from where else than the chinese. they have not been all that accurate. >> it appears to come from a singular reporter onboard one of the ships. not from an authorized or official source. nevertheless, let's move forward. this is actually from you, the u.s. planes would drop a sonabuoy? >> the quickest thing is to get out there and cover that area as quickly as we can. ships move too slowly. you get the p-3s out there. d...