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Nonetheless, some entrants into the shelter business seem ignorant of the facts of nuclear survival; one Texas firm offered customers a standard cyclone cellar—a prefabricated tank—that, according to a local shelter expert, "popped out of the ground whenever it rained hard."
Shelter building is still far from being big business. Before it gets big, many builders will have to learn the difference between a shelter and a hole in the ground.
* To meet O.C.D.M. standards, a shelter may be built of concrete block, reinforced concrete or preshaped metal, must be shielded by three feet of earth, two feet of concrete, or three inches of lead and must provide at least 80 cubic feet of space for each occupant.