“Nevertheless, it is true,” replied Frank quietly.
“But your air supply, your torpedoes, your provisions,” exclaimed the German commander.
“Those we carry with us,” said Frank.
“Then,” said the German sarcastically, “yours must be a very remarkable submarine.”
“So it is,” replied Frank.
“Well, it will be impossible for her to get away,” said the German. “We have her bottled up, and all we need do is wait until she comes to the surface to replenish her air tanks; then we can sink her.”
“You’ll have a long wait,” said Frank. “She doesn’t have to come up for that purpose.”
“What do you mean by that?”
“Just what I say. The submarine to which I am attached carries no air tanks except those to be used in case of an emergency.”
“No air tanks! Then how do you get air?”