As the ship went on the sounds began to resemble the dashing and surging of a heavy body of water forced by a strong tide through a narrow gorge. Still nothing could be seen of land, which increased the strange sensations produced by so singular a phenomenon. Nothing either crew or officers could do would improve the situation, for in the ship's condition they were as helpless as children. The lead was cast, and sixty fathoms called. It was now evident that there was land close by. But the trail of the line only showed the more clearly that the ship was at the mercy of some rapid and dangerous current, perhaps being drawn into some whirlpool. Now the fog seemed to lift, and long lines of light were seen ahead, but it was only to be succeeded by greater darkness. Then the sounds began to change and vary; and while what seemed voices were heard singing and sighing overhead, the deep rush and roll of waters below had a strange and bewildering effect on the feelings. Now the moon seemed to be rising through the fog ahead, and a pale, white light gleamed for a few seconds, then disappeared, and all was dark again. And as the ship advanced, the bold outline of a high and nearly perpendicular bluff revealed itself above the fog, and had the appearance of hanging directly over the ship. There was no mistaking the danger now. In a few minutes more the ship was between walls of rock three hundred feet high, drifting swiftly through a narrow channel of deep and agitated water into a dark and dangerous cavern.