"So I believe."
"I know for a fact," declared the pilot. "The Huns constructed half a dozen for big guns to be directed seaward. The old R.N.A.S. knocked them about so badly that Fritz abandoned the idea. Now, does that suggest anything?"
"I'm afraid I don't follow you."
"The guns must have been served when they were in position."
"Admitted."
"And Fritz may make plenty of blunders, but he's no fool. Having placed the guns in position in well-concealed emplacements, he wouldn't send the ammunition along in the open. He'd connect the emplacements by passages to run the stuff up on tram-lines. You can take it from me, my festive, that if we dug down we'd break into a tunnel already provided for our edification."
"Sounds feasible," admitted Seton.
"Then when shall we start?" asked the pilot.
"Now," decided the Sub promptly.
Both men were warming to their work. Even if the desired result were not forthcoming, it was something to occupy their minds, and to ward off the deadly monotony.