They stretched away in their thousands across the upturned acres of the cavern roof.

Hand spasming, her gun blasted wildly over the cavern roof.

Shannow fired, but the bullet screamed away up into the cavern roof.

But the cavern roof was being pushed up and water was flowing in again.

With this in his right hand he turned the light upwards, and played it over the cavern roof.

Above, an enchanted forest of icicles hung from the cavern roof.

Normally, sinkholes are created by the collapsing of a cavern roof, which takes the ground above with it.

An enchanted forest of icicles hung from the cavern roof.

The outline of the collapsed cavern roof can be clearly discerned from a distance.

High against the cavern roof are great caps where the wires go.