We descended the mountain rapidly, and, the mineral forest once passed, I saw the lantern of the _Nautilus_ shining like a star. The Captain walked straight to it, and we got on board as the first rays of light whitened the surface of the ocean. CHAPTER X THE SUBMARINE COAL-MINES The next day, the 20th of February, I awoke very late: the fatigues of the previous night had prolonged my sleep until eleven o’clock. I dressed quickly, and hastened to find the course the _Nautilus_ was taking. The instruments showed it to be still toward the south, with a speed of twenty miles an hour and a depth of fifty fathoms. The species of fishes here did not differ much from those already noticed. There were rays of giant size, five yards long, and endowed with great muscular strength, which enabled them to shoot above the waves; sharks of many kinds; amongst others, one fifteen feet long, with triangular sharp teeth, and whose transparency rendered it almost invisible in the water. Amongst bony fish Conseil noticed some about three yards long, armed at the upper jaw with a piercing sword; other bright-coloured creatures, known in the time of Aristotle by the name of the sea-dragon, which are dangerous to capture on account of the spikes on their back. About four o’clock, the soil, generally composed of a thick mud mixed with petrified wood, changed by degrees, and it became more stony, and seemed strewn with conglomerate and pieces of basalt, with a sprinkling of lava. I thought that a mountainous region was succeeding the long plains; and accordingly, after a few evolutions of the _Nautilus_, I saw the southerly horizon blocked by a high wall which seemed to close all exit. Its summit evidently passed the level of the ocean. It must be a continent, or at least an island—one of the Canaries, or of the Cape Verde Islands. The bearings not being yet taken, perhaps designedly, I was ignorant of our exact position. In any case, such a wall seemed to me to mark the limits of that Atlantis, of which we had in reality passed over only the smallest part. Much longer should I have remained at the window admiring the beauties of sea and sky, but the panels closed. At this moment the _Nautilus_ arrived at the side of this high, perpendicular wall. What it would do, I could not guess. I returned to my room; it no longer moved. I laid myself down with the full intention of waking after a few hours’ sleep; but it was eight o’clock the next day when I entered the saloon. I looked at the manometer. It told me that the _Nautilus_ was floating on the surface of the ocean. Besides, I heard steps on the platform. I went to the panel. It was open; but, instead of broad daylight, as I expected, I was surrounded by profound darkness. Where were we? Was I mistaken? Was it still night? No; not a star was shining and night has not that utter darkness. [Illustration] The _Nautilus_ was floating near a mountain I knew not what to think, when a voice near me said: