I suppose hours must have passed, during which I stared through the darkness at the dull whitish phosphorescent glow which appeared through the gloom, and died out, and appeared and died out again and again, passing like clouds faintly illumined in a ghastly way, and all mingled with the confusion caused by that awful roar.  Then at last I began to feel that the rush of wind and water was passing over me, and that I was in some kind of shelter; and when I had once hit upon this, I had as it were grasped a clue.  I knew that I was lying on stones, and saw that rising above me was a mass of rock, which I knew by the touch, and this stone was sheltering me from the wind and spray.