I am working with classmates to come up with an lower cost for a storm shelter. We heard of a man who used a school bus and buried it.
We are exploring that idea and think it is a cheaper way to save larger groups of people (25 to 80) people. Plus, old school buses can be recycled by being used. Our team's cost estimate for this is under $5,000. A storm shelter for a family costs (starting at) $2,700. That is IF you live in a bigger city.
In our state - Mississippi - tornadoes are pretty severe, so our team think it would be safer to take shelter underground.
FEMA should have engineers study and draw up plans to make a school bus storm shelter planning guide. That would be really cool.