right. and we are zeroing in on both of the devices. and remember, he said also that when they made the turn and came back, what they detected had a slightly different frequency, meaning it might have been the second one. so that we may have both in this narrow field at this point. allen deale, we still don t know if this is it. we re being encouraged to be cautiously optimistic. we still don t know. but these are pretty positive indicators. absolutely. clearly, they don t want to raise the expectation until they really know. but this is this is extremely encouraging. and i certainly would expect we ll know within a few more days. it sounds like they re going to do a few more sonar passes before they really want to say they ve found that line of position that the commander was talking about. details with my panel of experts right after this. [ female announcer ] yoplait greek 100.
and that means finding wreckage. as of now, they still haven t found anything that s anything to do with flight mh flight 370. the prime minister of malaysia was also briefed by those running the search operation here. angus houston, the australian in charge told him that the search was going on, there s no timetable behind it. but he also warned that and this is the first hint of perhaps a slight change of strategy, that if they continue to find nothing, then a new approach might be needed. back to you guys. nbc s ian williams in perth, thanks so much. with us now is dr. allen deale, a former ntsb investigator and the author of air safety investigators using science to save lives one crash at a time. your book is dedicated to the families of previous plane crash victims and you write, ye shall know the truth and the truth shall make you angry. we ve certainly seen anger and confusion among the flight 370