Slowly it turned into a swirling pool of ink that drew her in, pulling her mind into its dark, impenetrable depths.

They looked sinister and unsettled, impenetrable depths that were waiting for the dead and the drowned.

The polar surfaces of that planet, shielded by impenetrable depths of cloud, proved after all not unendurably hot.

He saw the curling edge of white foam, the green impenetrable depths behind, the huge curve of inconceivable falling mass; but the mass did not fall.

Same pale irises, same impenetrable depth, opening onto a dream inaccessible to common mortals.

As we descended slowly we drifted directly over one of these abysses, into the impenetrable depths of which we sought to strain our eyesight.

Through slitted lids she looks down into the impenetrable depths, and something white glimmers in the light from far above.

The forest stirred in its impenetrable depth, and everything in it awoke.

Under the constant scratching of the Russians, the earth's skin had hived up for them what appeared to be an impenetrable depth of walls and furrows.

Cole shook his head, and the point of one of those hidden memories sank back down into safe, impenetrable depths.