How do we judge the quality of any zombie-survival shelter? At the Zombie Research Society, we use a scale called the DSM Scale, and that stands for defensibility, sustainability, and mobility. You can look at a place like Costco for instance, is that a good zombie shelter? A lot of people think they're going to go to a Walmart or a Costco when zombies come.
Defensibility: It does seem as like it's pretty defensible. It doesn't have a lot of different entrances and exits, big concrete walls. You can potentially live on the roof. Sustainability: The problem with a Costco is that any other hostile or desperate human within miles around is going to be also going to that Costco. If you've ever tried to go to a big box store on Black Friday you know it's not the place you want to be. Mobility: Costco might have a lot of stuff, but when it comes to the point at which you need to get out of there really quickly, you're not going to be able to take all that stuff with you. Mobility turns out to be the most important aspect of any zombie survival shelter.
If I create a bomb shelter with a storage container buried underground and there's just one entrance and exit, that maybe totally secure, but the problem is all it takes is for one hostile human or a group of zombies to be waiting outside, and eventually, I do have to come out.
On the DSM Scale, mobility turns out to be the most important aspect of any shelter. When push comes to shove, you need the ability to get out of your location from many different ways, as quickly as possible. When you're deciding where you want to hole up in the coming zombie plague, consider the DSM Scale when you're making your decision. If not, you might find yourself trapped in a location that essentially turns out to be your tomb.