Shelters are a type of base to protect people from emergency events like natural disasters.
Materials that can go against water disasters are reinforced concrete and steel frame.
Those materials are good because steel frame are recommended for vertical evacuation structures and it's quite strong.
Materials that can go against fire disasters are metal and aluminium foil.
Those materials are good because metal is strong and the foil doesn't burn easily so it can last a long time.
These a materials that can and should be used for when a fire or water disaster happens.
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