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What I want is the cheapest,safest shelter to withstand an f5 tornado. At times we can have heavy rain. A small enough for 5 small pets in cratesand maybe 4 people. Comfortable size if 2 of us and the pets sleep in it overnight. How would you build this shelter? So many feet underground? What size dome? Plastic sheeting with many layers of earth? What about the door? How would we construct a cheap yet sturdy safe door? Should we build 4 or 5 car lengths from the house and away from big, heavy trees? Last thing is cost estimate and how many bags should be bought? I know this is a lot. ?