BEIJING (Reuters) - China is to test a manned submersible that can reach up to 7,000 meters (23,000 feet) below sea level, the official Xinhua news agency reported on Friday, citing the State Oceanic Administration. Research on the submersible will be given "equal importance with China's space endeavors," the report said. China put a man in space in 2003, part of an ambitious space program that includes its first lunar probe launched last year.