“Yukimuro” is a “natural refrigerator” that is handed down in Joetsu, a snowy country.
“Yukimuro” snow cellars have been in use since days long past. They are made of winter snow, which is collected into a large pile and covered with straw and other materials to prevent the snow from melting. This is then used to store things such as food until summer.
Nowadays, a large warehouse is used to store food by partitioning it into a room for storing snow and a room for storing food.