I’ve been reading about tornado/storm/bomb shelters for awhile. For the last 6 years I’ve always been near some type of shelter. In 2005 I spent about 4 days in an 60′s bomb shelter to gain protection from hurricanes. Currently, the “container like unit” (it’s a converted ocean shipping container) that I’m living in has a cement structure right outside the door that I’m supposed to go in in an emergency. The local Djiboutians built it, it’s full of cracks from when they dropped it in place. It looks as if anyone that entered would be crushed by thousands of pounds of concrete.

Add some dirt on top to keep out the Jeepers Creepers monster.
So all this reading has resulted in some good finds, like this school bus fallout shelter. Several people have had this idea, 12 people in Mississippi stayed in one while their homes were destroyed.
Then there’s prefab fiberglass shelters that you just bury. The smallest one seats four adults and would really suck to be in. They also only lock from the inside, so if your neighbor has one of these bright white doors in their backyard all you need to do is beat them to it. Hopefully they stocked it with supplies.
Some Vietnam vets have buried 55 gallon drums to take refuge. Most just settle for cardboard boxes and spare change.
Another option (for some) is just a stronger house or a strong building. Rammed earth is a technique used by hippies to compact dirt, cement, sand, and other materials into a substance that’s hard as a rock. The buildings here that I thought were cement are actually rammed earth. I always assumed the Great Wall of China was Portland cement and cinder blocks but turns out it’s rammed earth also. Rammed Earth: Good for hippies, good for communists, good for you.