They were rising toward the mouth of the great shaft, yet still it seemed a long way off.

We are to build a great shaft straight up to the surface.

To destroy one, you had to take the "tap" - the head of the great shaft - and then travel down almost a mile.

Here the great cylindrical shaft ended in a half turn.

A stairway led upward from the platform, through the top of the great shaft.

A great shaft of brilliance flashed for an instant across the river behind her and she became a black outline.

The clouds had finally broken and let through great shafts of light.

The light grew before them; great shafts pierced the roof.

Slowly I circled the great shaft, looking for a means of ingress.

First the tower went, a great shaft that tipped forward and then plummeted over.