We build our underground shelters, not only very durable, but also with your comfort in mind.  They have the 4 inch channel skeleton which makes them stronger and also adds protection from debris which could fall and/or be driven into the ground.  Even below ground isn't completely safe, unless it has steel reinforced into it, or is constructed of steel.  During installation we drive a bull dozer and other large equipment over them, as the one picture in our web site.  You can drive your car over them and not affect them in the least bit.  Also you can be sure whatever does fall up there above you will remain up there, rather than in the unit with you.  

We know that a lot of people feel uncomfortable going  underground, even though they know this is the safest place to be in a storm or tornado.   Most people are surprised however when they go into our shelters.  Especially our Stair entry design.  The stair is designed with a large entry way which really makes it feel roomy.  We use a full size stairway which really gives you a feeling that you’re not so cramped inside.  The Below Ground models and Hill Side shelters are made basically the same, and both models can be viewed at our store.  However the Below Ground is buried so it's not possible to view the inside of this shelter, but by walking inside the Hill Side you can get the feel of how the Below Ground looks once inside.  The entrances way is the only difference in the two models.   

We cover them with tar mastic which protects them from rust.   The underground with stair is embedded in concrete for protection of the steel and to make sure they stay where you put them.  This basically ensure you do not have a 'float up' due to ground water.