The transport rolled deliberately into a monstrous, windowless, artificial cavern and the hillside closed behind it.

Nestled at the foot of a steep rise, inset into a mountain, was an artificial cavern, probably once used for industrial storage.

A camouflet, in military science, is an artificial cavern created by an explosion.

Each site contains a number of artificial caverns created in salt domes below the surface.

There were, of course, other entrances to the vast series of artificial caverns and chambers below.

Tonya gestured grandly about the huge artificial cavern.

His impatient voice echoed within the artificial cavern.

Krussel motioned toward the noise coming from the depths of the artificial cavern.

Huge curved pillars supported the rough stone ceiling above them, creating a vast artificial cavern to hold the ruins below.

Looking around, she spotted dozens of small winged bodies scattered about the floor of this artificial cavern.