More ideas from giovanni
You can go as far underground as you want, this is just recycling a missile silo, I'm thinking more of a underground City, very cool though.

The 'Doomsday shelter' being built below Kansas prairie where millionaires will be able to sit out the Apocalypse in style Four buyers have already invested in condos below the ground Fears range from pandemics, terrorism and solar flares

storm shelters underground - Bing Images.  Fallout shelter. This is one heck of a storm shelter!

Modern shelter designs are displayed including images, pics and drawings so that one can see that people no longer have to hunker in a dark bunker in order to stay safe.

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