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Round corrugated steel blast resistant shelters are built as water-tight units, meaning the seams are good at keeping water out, but in extreme conditions, or prolonged exposure to constant water, it will find a way in.  Our interior coating is durable and thick, and can also help prevent water leaking in in such situations, but its not 100%.  If you live in a drier area, like Arizona, then water tight is all you need.  Wetter ground conditions would be better fit for water proof shelters.  We apply a urethane coating to the locked seams, creating a life time guaranteed, waterproof finish.  We can do this while still using the corrugated design to allow for maximum burial depth, so there is no sacrifice with ground cover between the decision to water proof.