![]() The thermal pulse from a nuclear weapon will not penetrate through the dirt cover, into the interior of the shelter. They will fail catastrophically under these overpressure loads. ![]() Flat roofed steel shelters will not withstand these heavy over burdens because they cannot achieve "earth arching". Ten-foot shelters are designed to be placed into a 20-foot hole with 10 feet of cover. Nine-foot shelters will reach this level of protection in an 18-foot hole. Eight-foot shelters are built of the proper gauge to be placed into a 16-foot hole and to safely withstand the burden of 8 feet of dirt cover plus the additional overpressure of 200 pounds per square inch of air blast. Care must be taken to properly match the gauge of the steel to the shelter diameter. At this depth, 'earth arching' is achieved. ![]() In order to achieve protection to that level, the shelter must have an arched ceiling and the dirt cover over the shelter chamber must be equal to or greater than the diameter of the shelter. Corrugated steel pipe (CSP) shelters were tested and proven at the Nevada test site to blast pressures of 200 psi. ![]()
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