Pinging Sounds News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Kyle Koukol told Newsweek that the chimes you hear on a plane can indicate "something as simple as asking for a cup of coffee" from the cabin crew.

It's at a lower transmission frequency than the standard 37.5. a change possibly due to environmental factors. >> if there's a change in pressure on the ocean floor and the age of the particular batteries, the capacitants can change. >> reporter: they are guarding against intermission near the "ocean shield." 375 miles away, search crews haven't given up hope on the other pinging sounds reported by the chinese. two search areas but so far neither has reacquired the sound they need. australian officials say they will keep searching for that pinging sound until there is absolutely no doubt the p...

>> randy joins us now. you've been working with these beacons all day. how much water does it need be in before it starts pinging? >> reporter: they can survive in depths of 20,000 feet. what we want to show you tonight is how sensitive they are. we have this tin cup here. it has a moist paper towel in it. no water in it. this is one of the pingers. we have the tester right here. i'll be quiet for a moment as we put this in and just with a moisture paper towel listen to it activate right away. [ pinging sounds ] you hear that right away. it starts to work. we also want to tell you tonight we t...

The transmission level. >> meantime, they are guarding against noise interference, limiting the number of ships and aircraft near the ocean shield. 375 miles away, search crews haven't given up hope on the other pinging sounds reported by the chinese. two search areas, but so far neither has reacquired the sound they need. well, australian officials say they will keep searching for that pinging sound until there is absolutely no doubt the pinger batteries have expired. that means roughly another ten to 12 days or so. at the same time, locating debris is still critical. search crews have deploy...