A swimmer reacts after diving 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 man wearing boxing gloves reacts to the crowd before diving into a pool carved out of the thick ice covering the Songhua River in the northern city of Harbin, Heilongjiang province Jan 4, 2011. [Photo/Agencies]