A man dives off a block made from ice into a pool carved out of the thick ice covering the Songhua River in the northern city of Harbin, Heilongjiang province Jan 4, 2011. The swimming display is part of the Harbin International Ice and Snow Festival which will be officially launched on Jan 5. [Photo/Agencies]

A swimmer wearing gloves quickly gets out of a pool carved into the thick ice covering the Songhua River in the northern city of Harbin, Heilongjiang province Jan 4, 2011. [Photo/Agencies]