The passage curved in a wide sweeping arc of full ninety degrees, then opened into the control room proper.

The passage darkened, blackened and finally curved into a cavemed space filled with a dim twilight.

The passage curved steadily to the left.

Ryan held up his hand as the rough-floored passage curved sharply to the right, almost in dogleg.

The passage curved gently until he could see neither the entrance behind him nor the end of it.

The passage curved steadily downward and to the right.

The passage curved, and terminated at the lock.

The passage narrowed, then curved to the left for 50 yards.

The passage curved, but not into the blinding darkness that Rolf had expected.

The passage curved down and around, so black it was impossible to see.