“Well,” said Frank, “I can’t see that it will do any harm to tell you. We extract air from the water.”
The German commander leaned back in his chair and looked at the lad in amazement.
“Extract air from the water, eh?” he said slowly. “Do you mean to tell me that England has solved that problem?”
“She has, sir,” replied Frank quietly.
The German was silent for a long time before he said: “Then I must say that Germany has a hard job on her hands.”
Frank was silent and the captain continued:
“And how many such vessels have you in operation?”
Frank hesitated.
“Well, only a few right now,” he said at last. “But many more are in the process of construction.”
“And are you familiar with the operations of such a vessel, and of the method used?”