These were the Shelters.
Though built from a steel-like plating only a fraction of an inch thick, the
Shelters could withstand a direct hit from a small nuclear device, and there
were a vast array of defensive mechanisms armed and ready to dispose of
any insects who might be buzzing around with stakes and hammers in hand.
But what made these Shelters perfect, more than anything else, was one
simple fact—

“There’s no entrance?” D muttered from atop his horse.
Exactly. The jet-black walls that reflected the white radiance of the sun
didn’t have so much as a hair-sized crack.

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