beijing, and they're going to wait on some more information. it's just past midnight here. it's about 12:40 in the morning out here in kuala lumpur. so we're not supposed to hear anything more on this. and what it could be for at least 12 hours. into tomorrow, into the daylight time. so far, though, it is promising, and hopeful that this is mh-370. but people are being cautious at the moment. alex? >> understandably so. katy tur, thank you so much for that. let's bring in allen diehl, former investigator who helped solve complex air crashes during his time with the air force, the ntsb, and as well as the faa. the author of "air safety investigators:using science to save lives" joining us by skype. your first thoughts when you hear the news, this reported pulse signal reported by the chinese. >> like everybody, i'm cautiously optimistic. we have been on this emotional roller coaster before. we definitely need confirmation, and i think we should have that within several hours. >> okay. shouldn't there be two pinger sounds though, allen?