Workers stand on the roof of China's National Aquatics Center, dubbed the "Water Cube", in Beijing Tuesday, Dec 26, 2006. The center will host swimming competition at the 2008 Olympic Games. The sealing of the exterior bubble-like coating of the center was completed on Tuesday. The 30-meter-high and 80,000-square-meter Water Cube is made up of 3000 translucent, bubble-like air cells. (AP Photo/EyePress) ** CHINA OUT **