When Chris and Colleen Otcasek bought their house in California, they knew about an anti-radiation bomb shelter in the backyard, built during the Cold War. An engineer who’d lived in the house previously constructed it for himself.

Chris and Colleen thought that after more than 50 years there’d be nothing left of the shelter, but they couldn’t have been more wrong: it was in perfect condition, complete with paper towels, sleeping pills, tin cans, coffee, books, and magazines.