CHONGQING, Feb. 13 (Xinhuanet) -- The Chinese government launched an unprecedented "underwater palace" project Thursday in a bid to protect Baiheliang, the world's oldest water survey device which will be submerged once the Three Gorges reservoir is filled. ¡¡¡¡Shan Jixiang, director of the State Bureau of Cultural Relics, said that Baiheliang, an 1.6 km-long massive reef important for observing water level changes, will be covered by an elliptical transparent shield so visitors in the future can still see it. ¡¡¡¡The massive project, which will cost 140 million yuan (16.9 million US dollars), is expected to be completed in 2005....