He has lived all his life above the mine, and the deep passages are terrifying: "I had no idea where I was.

DD, go string lights back in the deep passages.

He felt the vibrations increasing, the deep passage of approaching sandworms.

This morning, we got the galleys around the point and in through a deep passage the local pilots knew about but the pirates didn't.

They were in a deep dark passage that seemed still to go up before them, though at a gentler slope and without steps.

Who knew, thought the younger man, what resided in the deep, dark passages of that devious brain?

One of these mines was explored in 1966 using scuba gear, but the deeper passages were not fully explored.

Sweeping the floor, the tiny flashlight picked out a clump of tumbled debris which marked the deeper passage.

They are separated by deep passages two to three km wide.

The deep passage narrowed and curved off to the left about a quarter of a mile north.