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(140405) -- SOUTHERN INDIA OCEAN, April 5, 2014 (Xinhua) -- Photo taken on March 29, 2014 shows Chinese patrol ship Haixun 01 searching in souther India Ocean. Chinese patrol ship Haixun 01, searching for the missing Malaysian passenger jet MH370, detected a pulse signal with a frequency of 37.5kHz per second in southern Indian Ocean waters Saturday. A black box detector deployed by the Haixun 01 picked up the signal at around 25 degrees south latitude and 101 degrees east longtitude. It is yet to be established whether it is related to the missing jet. (Xinhua/Bai Ruixue) (djj) (Photo by Xinhua/Sipa USA)
(140405) -- SOUTHERN INDIA OCEAN, April 5, 2014 (Xinhua) -- Photo taken on March 29, 2014 shows Chinese patrol ship Haixun 01 searching in souther India Ocean. Chinese patrol ship Haixun 01, searching for the missing Malaysian passenger jet MH370, detected a pulse signal with a frequency of 37.5kHz per second in southern Indian Ocean waters Saturday. A black box detector deployed by the Haixun 01 picked up the signal at around 25 degrees south latitude and 101 degrees east longtitude. It is yet to be established whether it is related to the missing jet. (Xinhua/Bai Ruixue) (djj) (Photo by Xinhua/Sipa USA)

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Teams race to sounds detected in ocean

Search teams are racing to discover if sounds detected in the Indian Ocean came from a flight recorder on MH370.

Teams race to sounds detected in ocean

Search teams are racing to discover if sounds detected in the Indian Ocean came from a flight recorder on MH370.