and there's no underwater pinging sound which sonar would pick up if in fact the sonar -- those listening to sonar were in the right region. we have no debris. no transmitters or pinging and no known last location. >> tom, let's talk about that transmitter. this plane broke contact very abruptly, what do you make of that? >> the experts are suggesting that that would suggest there was a sudden decompression or sudden emergency that incapacitated the crew. if you suddenly lose all contact, no radio communication whatsoever, no mayday distress call, then for some reason that crew was unable to communicate. their first obligation is of course to afiate and navigate and communicate. an air traffic controller can't help you if you are trying to hold your plane together. the fact there was no conversation whatsoever and the plane left the projected trajectory of the radar path

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