“And so they kept on and on and on, rushing down the mysterious subterranean river, but they came to no more cataracts.
“On and on, for days perhaps; for aught they knew for weeks.
“The regions in which they now found themselves were oppressively hot, but they only slept the sounder. Awakening one night, if one may so speak of a time that was all night, they were surprised in the extreme to find themselves in the midst of a strange glimmering light. It was a light by which they could see each other’s faces, and blue and ghastly they looked, but a light that cast no shadow, at which they marvelled much, till they found out that the river here had broadened out into a kind of lake, that the rocks all round them were covered with fungi or toadstools, all emitting a phosphorescent glimmer, and that the water itself contained thousands of strange fishes, and that these all gave light.
“There was but little current here, so paddles were got out, and the boats helped onwards, though, to tell the truth, both my grand-dad and Tom Turner were more frightened at the strange spectral light that now glared round them, than they had been of the darkness.
“The fishes, too, looked like things uncanny, and indeed they were wholly uncouth and quite dissimilar in shape and actions from anything they had ever seen in the world above.
“They had reached a part of the river when it began once more to narrow and the current to become stronger, while at the same time it began to get darker, and the spectral-like fishes fewer. But suddenly Tom clutched my grand-dad by the wrist with his disengaged hand, and with a visage distorted by terror he drew his attention to something that lay half curled up at the bottom of a deep slimy pool.
“However dark it had been they would have seen that awful creature, for its body from stem to stern was lit up with a phosphorescent gleam. It was in the shape of a gigantic snake, full twenty fathoms long, with two terrible alligator-like arms and claws in front. It had green glaring eyes, that never closed or winked. Its whole appearance was fearsome enough, my grand-dad said, to almost turn a beholder into stone.
“Whether it was asleep or awake they could not tell, but it seemed to glide astern as the boat swept over it, and gradually to lose shape and disappear. In a few minutes more they were plunged once more in Cimmerian darkness.
“For many days the boats plunged on and on over the subterranean river, till their very life became a burden and a weariness to them, that they would gladly have laid down for ever.
“But one time, on awaking from a deep sleep, they found that something very strange and unusual had occurred. They were still in darkness, but not altogether in silence; the water made a lapping sound on the rocky river bank, and the boat was no longer in motion.