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When the Zwicks unlocked the heavy, metal hatch, they found watertight Army surplus boxes floating in 5 feet of water that had seeped into the shelter. "We assumed it was just this empty space," Hollar-Zwick said. What they didn't know - and wouldn't discover until they ventured into the shelter more than a decade later - was that the previous homeowner stocked the bunker with food and survival supplies in 1960. When Ken Zwick and Carol Hollar-Zwick bought their home in 1999, they knew the backyard contained an underground fallout shelter built during the height of the Cold War. Watch Video: Wisconsin family finds fallout shelter fully stocked
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