The current bore them on until the white wall rounded off and was lost to sight beyond the mass of darting creatures. Here was slack water, and with desperate effort he swam back, pushing the small enemies out of his path, meeting some resistance and receiving a few bites, until, in a hollow in the wall, he found temporary refuge and time to think. But he could not solve the problem. He had not the slightest idea where he was or what had happened—who and what were the strange black creatures, or why they had threatened him. His thoughts were interrupted. Another vibrant roar sounded, and there was pitch-black darkness; then he was pushed and washed away from his shelter, jostled, bumped, and squeezed, until he found himself in a dimly lighted tunnel, which, crowded as it was with swimmers, was narrow enough to enable him to see both sides at once. The walls were dark brown and blue, broken up everywhere into depressions or caves, some of them so deep as to be almost like blind tunnels. The dog-faced creatures were there—as far as he could see; but besides them, now, were others, of stranger shape—of species unknown to him. A slow current carried them on, and soon they entered a larger tunnel. He swam to the opposite wall, gripped a projection, and watched in wonder and awe the procession gliding by. He soon noticed the source of the dim light. A small creature with barrel-like body and innumerable legs or tentacles, wavering and reaching, floated past. Its body swelled and shrank alternately, with every swelling giving out a phosphorescent glow, with every contraction darkening to a faint red color. Then came a group of others; then a second living lamp; later another and another: they were evenly distributed, and illumined the tunnel.