ago a cyclone that basically went around that whole area. >> right. >> and it could have blown stuff, who knows where. >> right. 32 days after the disappearance, 100 mile disappearance and current and wind and waves. >> if they heard what they believed to be the pinging coming from two black boxes, one for two hours, every second for two hours, different levels of audio, if you will, and another 15 minutes from a second black box, the flight data recorder, cockpit voice recorder, why isn't that enough to send that unmanned sub, if you will, underneath to start looking for it? >> you would think that that would be enough. it seems like a lot of data. but the problem is, in order -- the acoustics of the ocean can fool you. in order to really triangulate, to hone in on the location, you need multiple hits from multiple angles. you actually do a criss-cross pattern and you'll able to hone in on the location.