A swimmer reacts after finishing his competition in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. The swimming competition was held on the official launch day of the Harbin International Ice and Snow Sculpture Festival. (Photo by Kim Kyung-Hoon/Reuters)

Officials hold a gun and flag as swimmers prepare to dive into a pool carved into the thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A swimmer competes in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A female swimmer dives into a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A swimmer reaches the finish line in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Dancers in costumes symbolizing sheep leave after finishing their performance to celebrate the Harbin International Ice and Snow Sculpture Festival at the Songhua River in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A female swimmer reacts after finishing her competition in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Visitors look at a swimmer who finished his competition in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A female swimmer climbs out a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A swimmer competes in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Swimmers dive into a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Spectators look at swimmers as they walk toward a starting line at a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A swimmer pours water out of her boots after finishing her competition in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Dancers in costumes symbolizing sheep dance with visitors at an event to celebrate Harbin International Ice and Snow Sculpture Festival at the Songhua River in the northern city of Harbin, Heilongjiang province January 5, 2015. (Photo by Kim Kyung-Hoon/Reuters)