The book is nice, and really eye-opening, but in the practice, the bomb will probably be dropped when people are living their life, so probably the people that you love won't be all at home under the shelter. So imagine the scenario where your kid is in kindergarten, your wife/husband at work. You can survive the drop on your little basement, but you will want to go out to save your beloved as soon as you can, instead of stay 14 days there eating tuna, drinking bottled water and cranking your little shortwaves radio.