Prepping a fallout shelter might sound like an exercise from an era of soda fountains and hula hoops. But for Ron Hubbard, president of Atlas Survival Shelters, business is, well … booming. Ron says he sold a shelter a month when he started out in 2011. Now he sells about one a day — from a barebones hideout to a luxury model that doubles as a wine cellar. So, why are 60s-style underground fallout shelters no longer so, well, underground? On this bonus episode from The World's partners at the podcast, Things That Go Boom, Host Laicie Heeley speaks with nuclear expert Sharon Squassoni who says the threat of nuclear war is as grave now as the darkest days of the Cold War. One reason for the heightened concern is President Trump’s decision to pull out of the Iran Nuclear Deal. But that decision also tells us a lot about how US foreign policy is shifting. Could the decision to withdraw render the US irrelevant? Did it make us safer? Or should we all be building fallout shelters in our backyards?