Description:These soldiers are preparing themselves for a special drill, the South Korean army's annual winter training. The 230 soldiers are members of the South Korean army's Special Forces. Half naked, the soldiers brave the freezing temperature of Pyeongchang, the host city of the 2018 Winter Olympics, which is minus 20 degrees Celsius, or minus four degrees Fahrenheit. And add to that a dip in ice cold water. But 24-year-old soldier Kim Sung-hoon says the cold is bearable.(1:43)