next, which I call the chamber of egress, carefully closing the door behind us.”

The professor, suiting the action to the word, ushered his companions into the next chamber, closing the door behind him, and they found themselves in a small room some ten feet square by seven feet in height. This room, in common with the diving-room, was brilliantly lighted by an electric lamp inclosed in a lantern of abnormally thick glass.

“Arrived here,” continued the professor, “we are all ready to sally forth upon our submarine explorations; all we have to do therefore is, first to fill the chamber with water by means of this valve, then open the trap-door and step forth upon the bottom of the sea.”

As the professor said this he released the fastenings of the door, and it fell down, forming a sort of inclined plane, over which they passed, to find themselves once more on the solid earth, under the ship’s bottom, with the starboard bilge-keel rising like a wall of silver before them. They passed along the lane formed by this keel and the cylindrical bottom of the ship, and then stepped back with one accord to take another glance aloft at the huge bulk of the ship as she towered high above them. They now became conscious of the sounds of vigorous hammering and of men’s voices in the direction of the river gable of the building shed, and on looking in that direction they saw that the contractor, whom the professor had engaged for the purpose, was already at work with his men removing the boarding which had hitherto concealed the Flying Fish from passers-by on the river, thus making a way for the exit of the ship a little later on.

The little party had re-entered the hull by way of the trap-door, and the professor had just made the fastenings once more secure, when, far away aloft from somewhere within the recesses of the ship, they heard the loud, sonorous, sustained note of a gong.

“Ah, that is good!” exclaimed Herr von Schalckenberg, rubbing his hands; “that is the dinner gong; and I am hungry. Come, my friends, to the dining saloon, and let us partake of the first of, I hope, many pleasant meals on board the Flying Fish.”