Why you don't have my older sister explain things to calm down a young child.
This is a bomb shelter:
I grew up just outside Washington DC, and was in fourth grade when the Cuban Missle Crisis happened, and the news was all about immanent nuclear war.
On our way to school, we walked past a house where they were building a shelter like this one, with great mounds of dirt from digging and all manner of impressive mess.
So my older sister explained to me that we didn't have to worry about not having a shelter for our family.
If anyone bombed DC, we'd all be just off-center in the huge crater anyway.