The story happens in December. December 6 is Constitution Day (宪法日) in Spain. Many people visit their families. They have five days off.
It is very cold in the north of Spain this December. There is a lot of snow. The average temperature (平均气温) there in December is usually 5℃~13℃. It is not very normal at the beginning of December. The government (政府) says that it is better to go home. The weather will be worse on the weekend. Many cars will be on the roads.
A water reservoir (水库) in eastern Spain freezes. A dog gets stuck in the water. It cannot get out. The dog is in the water for hours. Then, two police officers help the dog. They take off their clothes. They get in the cold water. They break the ice. The dog is safe in the end. The two men are heroes.