The fishermen on sun Island have a traditional custom in winter, that is "Ice fishing on the frozen Songhua river", this is their lifestyle. As you know, Harbin is cold in winter as the temperature goes below 20 degree Celsius, Songhua river is frozen by then. The fishermen first dig a 1-meter-diameter hole on the river by using the iron bar and chisel , then put a big fishing net inside the hole. After almost 30 minutes, the fishing net is pull out from the hole, at this time, some fish are in the fishing net already; lots of fun!