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Passengers' family members. 50 days spent searching for flight 37 o and still nothing. fueling frustration among passengers' family members. outside the malaysian embassy in beijing, families of the chinese passengers angry demanding answers, chanting no more delays, no more lies. . >> what do you concretely want from the malaysian government right now? >> the truth. the thing they're hiding. >> reporter: with the bluefin coming up empty, crews are now expanding the search to areas adjacent to the six-mile radius surrounding the sec ping. >> it's really a hot mess right now. we were given very...

Discussing now, hammering out a longer-term search agreement. one of the things that the malaysians had proposed is broadening out the search area. right now they're only searching a 6-mile radius around that second ping, that second acoustic detection picked up by the towed pinger locator. well, there are three other detections that were made. some analysts suggesting maybe they should do the same for those areas as well, also suggesting, perhaps, a broader search area along that arc, the so-called half handshake between the plane and the inmarsat satellite, where some authorities have said t...

Erin mclaughlin is live in perth for us this morning. erin, you know, 90% done yesterday, 95% done today, but still, there's a real discrepancy on when they are going to say, all right, this bluefin-21 is complete in searching that entire search zone, that it could be days or it could be weeks. >> reporter: that's right, poppy, but malaysian and australian authorities already discussing next steps, what to do next, if they basically in the end rule out this narrowed area, which is essentially their best guess as to where the black box may be. now, i understand the malaysians have proposed a lo...

Today, potentially the final day of searching the part of the ocean investigators thought was their best hope. >> place they had to look because they had the pings, they had the inmarsat data, had the fuel consumption of the aircraft. >> reporter: crews so far covered 90% of a 6 mile radius area with the bluefin looking for the missing malaysian plane with no luck. nearly three weeks ago the towed pinger locator detected signals in close proximity thought to be from the plane's black boxes. crews said the second ping was the highest quality and they launched the bluefin in this small area firs...

Breaking news as investigators are down to the last 10% of the designated search area. so far in that area no evidence of flight 370. the american navy's underwater drone may be conducting its last in the area. miguel is in perth. what are you learning tonight? >> well, we believe that 12th dive is probably complete by now and they're downloading the data and finishing it up. so presumably, they are through very close if not entirely the area of 150 square miles of the area around that second ping. that then raises the question what next. will they continue to do a little more searching around...