sharp turn left. a sharp turn west, and that focused the search area in the southern arc. a few days later debris is spotted floating on the ocean. turned out to be sea bar g-- garbage. on march 24th, they declared the flight ended in the southern indian ocean. it was flying faster than previous thought, shifting the search area nearly 700 miles. earlier this month, a series of pings are detected by chinese and australian vessels. on april 16th, a bluefin 21 underwater drone was launched, and that's where we are today. and we've still found nothing. no black boxes, no debris, nothing. so let's talk about that. i want to bring in michael kay, a cnn aviation analyst and retired lieutenant colonel in the british military. >> hi, carol. >> hi. >> and rob mccallum, cnn analyst and ocean search specialist. welcome to both of you. >> morning. >> so michael, every hope dashed. the bluefin 21 is 90% done