Photo taken on March 21, 2014 shows Chinese patrol ship Haixun 01 searching in souther India Ocean. A pulse signal picked up by Chinese patrol ship Haixun 01 Saturday has not been confirmed as related to missing Malaysian passenger jet MH370, according to China Maritime Search and Rescue Center. A black box detector deployed by the Haixun 01 picked up the signal with a frequency of 37.5kHz per second at around 25 degrees south latitude and 101 degrees east longtitude in southern Indian Ocean waters Saturday afternoon. (Xinhua/Chen Weiwei)