Again came a terrific detonation. But the vessel ploughed on.
"Presently they will fire to hit our periscope and make us rise to the surface. Von Salzinger has gone further than I had dared to hope."
"Hope?"
"He will pay for this with his position."
"But if they hit our periscope?"
The Prince shrugged.
"It will make no difference. We shall not rise till it suits us. We have the light. Already we must be nearly through the mine-field. Once we are through the mines Ludovic could make the journey seawards blindfold."
The Prince crossed over to his chair, and laid the sealed rolls on the table beside him. He did not speak. He was obviously listening.
Presently another sharp explosion sounded overhead, and his eyes lit.
"Ah, I thought Von Salzinger would not resist it. You see, he is a Prussian." He smiled, but his eyes had lost their humor. "That was shrapnel," he went on. "Its bursting is unmistakable. But he will not hit the periscope."