Relatives of Chinese passengers onboard the missing Malaysia Airlines plane, Flight MH370, cry as they pray in a prayer room in Beijing, China, Friday, April 4, 2014. Crews searching for the missing Malaysia Airlines jet launched a targeted underwater hunt on Friday for the plane's black boxes along a stretch of remote ocean, with just days left before the devices' batteries are expected to run out. Chinese characters for words of consolations are seen at top right. (AP Photo/Ng Han Guan)