shield has detected signals consistent with those of aircraft black boxes. the audible signal sounds to me just look an emergency locator beacon. reporter: the ocean shield picked up two distinct pinger alerts here. these signals detected 350 miles away from an area where a chinese ship picked untwo audio signals on saturday. britons hms echo has been moved there to investigate. they do not believe it s related to the ocean field find. i d say it s unlikely. but in deep water, funny thing happen with acoustic signals. reporter: officials dress they need to find wreckage before they can confirm any of these ping, related to the missing plane. we haven t found the aircraft yet. we need further confirmation.