a second shock took place, this time from behind. I turned pale. My companions were close by my side. I seized Conseil's hand. Our looks expressed our feelings better than words. At this moment the captain entered the saloon. I went up to him.
"Our course is barred southward?" I asked.
"Yes, sir. The iceberg has shifted, and closed every outlet."
"We are blocked up, then?"
"Yes."
CHAPTER XVI
WANT OF AIR
Thus, around the Nautilus, above and below, was an impenetrable wall of ice. We were prisoners to the iceberg. I watched the captain. His countenance had resumed its habitual imperturbability.
"Gentlemen," he said calmly, "there are two ways of dying in the circumstances in which we are placed." (This inexplicable person had the air of a mathematical professor lecturing to his pupils.) "The first is to be crushed; the second is to die of suffocation. I do not speak of the possibility of dying of hunger, for the supply of provisions in the Nautilus will certainly last longer than we shall. Let us then calculate our chances."
"As to suffocation, captain," I replied, "that is not to be feared, because our reservoirs are full."
"Just so; but they will only yield two days' supply of air. Now, for thirty-six hours we have been hidden under the water, and already the heavy atmosphere of the Nautilus requires renewal. In forty-eight hours our reserve will be exhausted."
"Well, captain, can we be delivered before forty-eight hours?"
"We will attempt it, at least, by piercing the wall that surrounds us."
"On which side?"
"Sound will tell us. I am going to run the Nautilus aground on the lower bank, and my men will attack the iceberg on the side that is least thick."
Captain Nemo went out. Soon I discovered by a hissing
