Whenever you design new construction or make a major renovation, a shelter should be included as a part of the plan. Even if you do not foresee an immediate need, the extra square footage or increased building mass will add resale value to the finished project.
Emergency shelters are not just a safeguard during war. Natural events, such as tornados, require serious sheltering protection against deadly flying debris. Also, if your primary residence is made unlivable (such as from a fire, hurricane, or Alaskan winter storm), then a temporary shelter, such as a tent, will be required for protection from insects and the elements.
On a separate note... It is shocking to discover in this new millennium how few people understand the power difference between an Atomic (fission) and Hydrogen (fusion) explosion, but this is probably why so many laugh at any suggestion of surviving an Atomic (fission) explosion unscathed. To use an analogy, the power of the two explosions are like the differences between that of a cherry-bomb and a hand-grenade.
With an Atomic (fission) explosion, as with a large conventional explosion, the main concern is with heat and blast. With a Hydrogen (fusion) explosion, the main concern is that of fallout. Over the course of the last century the probability of what weapons would be used by big countries, small military units, and fundamentalist groups has shifted back and forth. Currently a large conventional or small yield fission explosion is the most likely explosion that would be deployed against civilians, as is revealed by the recent US government emphasis away from radiation/fallout shelters and back toward blast/storm shelters.
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