Are there any ventilation down there?

This may keep you safe from atmospheric and radiation dangers but not from other people. And where is ventilation, water storage, electricity, waste storage ?

That's great, until the power gets cut...

Prices for these start at $50k, about the price for a nice car. They don't seem like millionaire prices to me.

I just googled them and there they were. http://www.atlassurvivalshelters.com/aboutus/nbc/corrugated/

Sustainable power and ventilation and clean water is the name of the game.....and her to keep you occupied!