For ten miles-an endless distance it seemed-they dropped through clouds utterly impenetrable to the eye.

Dust, flames, and smoke roiled in an impenetrable cloud in front of them.

Sinai, for them, is wrapped in impenetrable cloud.

It was like flying into a giant tube whose circular walls were forged with swirling, impenetrable clouds.

As the sun dropped lower, impenetrable clouds above blotted out the remaining sunlight, quickly lowering the air temperature.

Despite the careful work of engineers, Voyager 2 saw only impenetrable cloud at Uranus.

He pointed across the deep ravine at the impenetrable cloud of yellow dust.

There were no other ships visible, and no aircraft in the impenetrable clouds above.

It was impossible to tell, because the area was covered by impenetrable clouds.

The fine bottom silt had been stirred up by a rapid movement, leaving an impenetrable cloud of muck.