By John Ruwitch and Megha Rajagopalan JIANLI, China (Reuters) - Rescuers searched a sunken cruise ship in the Yangtze River on Wednesday for more than 400 missing people, many of them elderly, but hopes of finding more survivors were fading in what could be China's worst shipping disaster in almost 70 years. State television showed rescuers, some standing gingerly on the upturned hull of the Eastern Star, and scores of divers working through the night.