"Let us go so far," he said. "Then we shall see."
He passed through, followed by Gourel, whom he told to leave the first door open, and walked to the other door, resolving within himself to go no farther. But this second door was shut; and though the lock seemed to work, he could not succeed in opening it.
"The door is bolted," he said. "Let us make no noise and go back. The more so as, outside, by remembering the position of the tunnel, we can fix the line along which to look for the other outlet."
They therefore retraced their steps to the first door, when Gourel, who was walking ahead, gave an exclamation of surprise:
"Why, it's closed! . . ."
"How is that? When I told you to leave it open!"
"I did leave it open, chief, but the door must have fallen back of its own weight."
"Impo
