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There are signs that underground shelters, almost-forgotten relics of the Cold War era, are making a comeback. The Vivos network, which offers partial ownerships similar to a timeshare in underground shelter communities, is one of several ventures touting escape from a surface-level calamity. Radius Engineering in Terrell, Texas, has built underground shelters for more than three decades, and business has never been better, says Walton McCarthy, company president. The company sells fiberglass shelters that can accommodate 10 to 2,000 adults to live underground for one to five years with power, food, water and filtered air, McCarthy says. The shelters range from $400,000 to a $41 million facility Radius built and installed underground that is suitable for 750 people, McCarthy says. He declined to disclose the client or location of the shelter. "We've doubled sales every year for five years," he says.Other shelter manufacturers include Hardened Structures of Colorado and Utah Shelter Systems, which also report increased sales.