khurasaan1
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They are not, at least I hope that they are not. Hardened Aircraft Shelters (HAS) are built with steel arches then often covered with earth, a layer of masonry, both, and if possible, allow grass to grow over.
and what if they get direct hit.....???...........
Oh! sorry I got my answer in ure above post....yes u explained it above very well...
but Im thinking isn't it better to have underground hangerz instead of above ground...to reduce anykinda risk during war etc.....