"I have your promise, gentlemen?" added Captain Nemo. "You have, captain," replied the engineer. The captain thanked the colonists by a sign, and requested them to leave him for some hours. Gideon Spilett wished to remain near him, in the event of a crisis coming on, but the dying man refused, saying, "I shall live until to-morrow, sir." All left the saloon, passed through the library and the dining-room, and arrived forward, in the machine-room, where the electrical apparatus was established, which supplied not only heat and light but the mechanical power of the _Nautilus_. The _Nautilus_ was a masterpiece, containing masterpieces within itself, and the engineer was struck with astonishment. The colonists mounted the platform, which rose seven or eight feet above the water. There they beheld a thick glass lenticular covering, which protected a kind of large eye, from which flashed forth light. Behind this eye was apparently a cabin containing the wheels of the rudder, and in which was stationed the helmsman, when he navigated the _Nautilus_ over the bed of the ocean, which the electric rays would evidently light up to a considerable distance. Cyrus Harding and his companions remained for a time silent, for they were vividly impressed by what they had just seen and heard, and their hearts were deeply touched by the thought that he whose arm had so often aided them, the protector whom they had known but a few hours, was at the point of death. Whatever might be the judgment pronounced by posterity upon the events of this, so to speak, extra-human existence, the character of Prince Dakkar would ever remain as one of those whose memory time can never efface. "What a man!" said Pencroft. "Is it possible that he can have lived at the bottom of the sea? And it seems to me that perhaps he has not found peace there any more than elsewhere." "The _Nautilus_," observed Ayrton, "might have enabled us to leave Lincoln Island and reach some inhabited country." "Good Heavens!" exclaimed Pencroft, "I for one would never risk myself in such a craft. To sail on the seas, good; but under the seas, never!" "I believe, Pencroft," answered the reporter, "that the navigation of a submarine vessel such as the _Nautilus_ ought to be very easy, and that we should soon become accustomed to it. There would be no storms, no lee-shore to fear. At some feet beneath the surface the waters of the ocean are as calm as those of a lake." "That may be," replied the sailor, "but I prefer a gale of wind on board a well-found craft. A vessel is built to sail on the sea, and not beneath it."