A round steel hatch in a lawn is all you see from above. Below it, buried about ten feet down, sits a corrugated steel tube fitted out with bunk beds, a sofa, a bathroom and filtered air. These photographs from Atlas Survival Shelters follow one underground shelter from delivery and excavation to the finished, furnished rooms beneath a patch of grass.
Who builds Atlas Survival Shelters?
Atlas Survival Shelters is an American manufacturer whose shelters ship mostly from its plant in north-east Texas. Its range includes round culvert shelters, modular square bunkers, poured-concrete shelters, backyard bunkers, safe cellars and several tornado shelters. The tube shelters in these photos are made from 12-gauge galvanised corrugated culvert pipe, 10 feet (about 3 metres) in diameter, with welded steel fittings. The largest models offer around 500 square feet of living space.
How an underground shelter is installed
Installation starts with a long excavated trench. A crane lowers the steel shell into place, the entrance section and service pipes are connected, and tanks and pipework are set alongside. The whole structure is then backfilled with earth until only the hatch, air vents and a few pipes show above ground.
Burial depth matters. Atlas recommends at least 36 inches (about 90 cm) of earth on top for radiation protection, at least 6 feet to keep the interior cool in summer, and 10 feet or more in the northern United States and Canada so the shelter sits below frozen ground. Culvert shelters are typically buried about 10 feet down and can go as deep as 42 feet.
Hatches, filtered air and the escape tunnel
From the surface, the finished shelter shows only its entry hatch, ventilation pipes and, in some designs, disguised covers such as fake rocks or tree stumps hiding equipment. Air comes in through an NBC (nuclear, biological and chemical) filtration system. Atlas includes it in the shelter price and uses Swiss and Israeli units from brands such as Andair, Temet and Lunor, each with a manual backup in case power fails.
Larger models also have an escape route: a crawl through a 42-inch pipe, up a ladder and through a sand-filled escape box, then about 12 inches of earth to dig through to reach the surface.
Inside the shelter: bunks, bathroom and storage
Inside, the curved steel walls enclose a narrow central passage with bunk beds along the sides, a lounge with a sofa and television, a bathroom with toilet and washbasin and a compact shower. At their listed capacity, shelters are stocked with at least 30 days of food and water, and the larger units with under-floor storage hold supplies for up to six months.
A cutaway diagram shows how the rooms, entrance and access routes fit together underground.
What an underground shelter costs to install
Shelter prices are listed on the Atlas website, but they do not include freight from the factory or installation. Installation crews charge by the hour, and Atlas suggests budgeting roughly 30% of the shelter's price for it: about $5,000 for a small shelter and $15,000 to $20,000 for one of around 500 square feet. An engineer's site visit costs extra. Local building rules, soil and groundwater also shape what a project needs. Full details are in the manufacturer’s FAQ and Atlas’s current product information.
For other unusual homes, see our feature on unusually situated homes, our treehouse design feature and the small-home living story.
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