By Swiss law, all inhabitants of the country must have access to shelter space. For many Swiss citizens, this space is in a large civil defense shelter, but for others, and specifically non-Swiss, this shelter space comes in the form of a heavy-duty basement shelter. The bomb shelter isn't a nice-to-have or a government recommendation, but mandatory. Yep, mandatory. If you or I were to move into a Swiss house, it would have a bomb shelter in the basement. Not bad, huh?
These aren't just namby-pamby, feel good shelters, they're serious, heavy-duty bunkers. Most Swiss houses are ruggedly constructed from concrete, and this continues in the bomb shelter, with thick, reinforced concrete walls. Thick steel and concrete, vault-style doors. Air-filters. Exactly the kind of thing most surival-minded Americans aspire to--standard in a Swiss home.
In the image below, you can see the big, heavy duty, vault-like door to the shelter.
These shelters are typically converted to a storage room (this particular shelter is full of stuff), but if well stocked and supplied, a family could be ready to outlast most any attack or natural disaster. And yep, once again, these are standard for Swiss houses.