NATIONAL UNDERGROUND AMERICA DAY 2021.This day is recognized for those who are living in the underground based areas in the US . People too liked to stay in underground archetypes houses /sheds across North America .The observance also celebrates the lifestyle, architecture, and benefits of underground living. Subterranean living boasts energy conservation as one of its top advantages. Completely covered homes or earth-sheltered homes are covered on all sides with soil while earth-bermed homes leave one side exposed. Both allow for more stable temperatures within the home and less exposure to the elements. By the way, these kind living homes have many obstacles ,and will get disadvantages in summer time and for many things.On this occasion let's praise for who was founded by Malcolm Wells in 1974.