A vessel in berthed amid floating ice chunks in Laizhou Port of Laizhou City, east China's Shandong Province, Jan. 15, 2010. The worst sea ice in 30 years appeared from early January along the coastline of the Bohai Sea and the Yellow Sea as cold fronts pushed temperature to minus 10 degrees Celsius and below. By now over 40% of the sea surface of Bohai Sea has iced up. [Chu Yang/Xinhua]