"How many men are there on board the Nautilus, do you think?"

"I cannot tell, my friend."

"I should say that its working does not require a large crew."

"Certainly, under existing conditions, ten men, at the most, ought to be enough."

"Well, why should there be any more?"

"Why?" I replied, looking fixedly at Ned Land, whose meaning was easy to guess. "Because," I added, "if my surmises are correct, and if I have well understood the Captain's existence, the Nautilus is not only a vessel: it is also a place of refuge for those who, like its commander, have broken every tie upon earth."

"Perhaps so," said Conseil; "but, in any case, the Nautilus can only contain a certain number of men. Could not you, sir, estimate their maximum?"

"How, Conseil?"

"By calculation; given the size of the vessel, which you know, sir, and consequently the quantity of air it contains, knowing also how much each man expends at a breath, and comparing these results with the fact that the Nautilus is obliged to go to the surface every twenty-four hours."