On my left there seemed to be a black opening of some sort.

His body slid through the black opening of the floor below.

Just behind that ledge there was a dark, black opening.

A black opening showed ahead, above the level of the floor.

But ahead, on the right, a single black opening showed.

He stayed flat on the ground, then turned and called down into the black opening.

Behind it was the black opening of a narrow door.

"It had two very long black openings on the front that came to a point," he said.

She stared at the black opening in the metal thing.

He was starting around it when a black opening suddenly appeared and men began to push their way out.