Did the Chinese Hear the Black Box Pinger?

The crew on board a Chinese patrol ship says they twice detected possible pings; unclear if they're related to flight MH370.
3:00 | 04/06/14

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Transcript for Did the Chinese Hear the Black Box Pinger?
ocean. Now in a separate area, the Australians say they may have heard something as well. It's all happening as the batteries are running out of juice. Clayton Sandell is in Perth, Australia with the latest. Reporter: Good morning. They are the most promising developments since Malaysian airlines 370 went missing. Are they legit or a false lead? Making an urgent swing to this Chinese pra troll ship. They twice detected possible pings. This is an important and encouraging lead. But one which I encourage you to continue to treat carefully. We are working in a very big ocean and within a very large search area. Reporter: This morning, reports say the Chinese used this simple hand-held device to hear those pings. If so, the maker of the device tells the New York times it wouldn't be able to hear them in a deep ocean. A british royal Navy ship is bringing more sophisticated gear for listening under water. But a second Australian ship now won't be coming right away. It's chasings it own lead, a third mysterious sound 350 miles away. It could be something or nothing. We're dealing with very deep water. We're dealing with an environment where sometimes you can get false indications. Reporter: This morning, search teams are focusing further south because a new analysis of satellite data reveals the Boeing 777 may have been flying faster than first thought, possibly going down close to where the Chinese picked up the signal. Search teams are focusing further south because a new analysis of satellite data may have been flying faster than first thought, possibly going down very close to where the Chinese picked up that signal. But so far, weeks of searching the Indian ocean has failed to turn up any real evidence. And tracking down these leads is more urgent than ever because the pings may be just days away from going silent. Batterying running out. Officials cannot verify when the Chinese or the Australians heard. They hope to learn more in the next 24 hours. That british ship should be on the scene early Monday morning. Dan, bianna. So much frustration for the families wanting answers. Thanks to you. And following flight 370 all day here on ABC news and all week.

This transcript has been automatically generated and may not be 100% accurate.

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