National Underground America Day

History of National Underground America Day

National Underground America Day started in 1974, thanks to Malcolm Wells, an architect with a big idea. He wasn’t interested in towering skyscrapers or sprawling cities. Instead, he dreamed of homes and buildings nestled beneath the Earth’s surface, blending into the landscape rather than disrupting it.

His passion for underground architecture wasn’t just about design—it was about sustainability. He believed the future of construction should work with nature, not against it.

Wells spent much of his career promoting earth-sheltered living. He saw how traditional buildings consumed energy and altered the environment, and he wanted a better way. Underground structures, he argued, stayed naturally warm in winter and cool in summer.

They required less energy, created less waste, and protected open land. His ideas weren’t just theory—he put them into practice, designing innovative underground spaces that still inspire architects today.

Creating a national day wasn’t about self-promotion. Wells wanted to spark curiosity and challenge people to rethink what a home or workplace could be. Could living underground be a smarter, greener choice? Could buildings exist without scarring the land?

He hoped this celebration would encourage exploration and creativity. Even those who never considered underground life might start seeing the possibilities.

Over the years, the day has grown beyond just architecture. It now highlights sustainability, energy conservation, and a deeper connection to the planet.

His vision still matters. As cities expand and resources shrink, looking beneath the surface might hold the answers. National Underground America Day isn’t just about homes under the soil—it’s about thinking differently, questioning the norm, and finding smarter ways to share space with the world around us.

Facts About National Underground America Day

Thermal Stability of Earth-Sheltered Homes

Earth-sheltered buildings take advantage of the relatively constant temperature of soil a few feet below the surface, which in many climates stays close to the annual average air temperature and changes far more slowly than surface air.

This natural thermal mass can significantly reduce heating and cooling loads, with studies in the United States showing well-designed earth-sheltered homes using 50 to 80 percent less space-conditioning energy than comparable conventional houses.  

Moisture and Drainage Are the Biggest Technical Hurdles

While the surrounding earth provides insulation, it also introduces serious moisture challenges.

Successful underground or earth-sheltered buildings rely on meticulous waterproofing, perimeter drains, and careful site grading, because water pressure from soil can force moisture through even small flaws in the building envelope.

The U.S. Department of Energy notes that drainage design and waterproof membranes are typically more critical, complex, and expensive for earth-sheltered homes than for aboveground construction.  

Underground Housing Surged After the 1970s Energy Crisis 

Modern underground and earth-sheltered housing in North America grew from a niche idea into a recognizable movement after the 1973 oil embargo and subsequent energy crisis.

Rising fuel prices and concerns about energy security led architects and homeowners in the late 1970s and early 1980s to experiment with sod roofs, bermed walls, and fully or partially buried homes as a way to cut energy use and blend buildings into the landscape, a trend documented in contemporary U.S. Department of Energy and housing-industry reports.  

Coober Pedy’s “Dugouts” Show Large-Scale Underground Living 

In Coober Pedy, a remote opal-mining town in South Australia, more than half of the population is estimated to live in “dugout” homes carved into hillsides or former mine sites.

Residents turned to underground living in the early 20th century to escape extreme desert temperatures that often exceed 100 degrees Fahrenheit, and today the town includes underground churches, shops, and hotels that maintain cooler, more stable indoor climates than aboveground structures. 

The World’s Largest Underground Shopping Complex Lies Beneath Montreal

Montreal’s “Underground City,” more formally known as RÉSO, is a network of over 20 miles of pedestrian tunnels connecting metro stations, offices, universities, and shopping centers beneath downtown streets.

Developed gradually from the 1960s onward, it encompasses dozens of buildings and some of Canada’s largest malls, illustrating how dense urban activity can be shifted below the surface to shelter people from harsh winter weather.  

Norway’s Subterranean Opera Stage Uses a Natural Cavern

In the former mining town of Løkken Verk, Norway, a disused pyrite mine has been transformed into the Bergtatt venue, where concerts and performances take place inside illuminated rock caverns.

Audience members travel by boat along an underground lake to reach the stage, showcasing how abandoned subsurface industrial spaces can be repurposed for cultural and tourist uses instead of being sealed or left derelict.  

Working Underground Can Disrupt Circadian Rhythms 

Extended time in underground workplaces such as mines or deep research facilities has been linked to disturbances in circadian rhythms due to limited exposure to natural daylight.

Occupational health studies of miners and other subsurface workers report higher rates of sleep problems and fatigue, which has prompted recommendations for carefully designed artificial lighting schemes that mimic daylight patterns and scheduled opportunities for natural light exposure whenever possible.