"You will manage it. If I am not mistaken, a few hours' work with the iron will pierce through to the surface. Only take the greatest care."

"And what then?"

"There you have me! I haven't an idea. But I am inclined to think that your canny, close Scot is ready for us, has his plan of campaign thoroughly mapped out. I trust him the more because he has told us nothing. Well, you mount first--I'm afraid that's inevitable----"

"Of course----"

"I follow when you give the word, and I think our two young Chinese friends here will be men enough to join us. We make four: Mackenzie will have Jackson and your shikari, I suppose; your cook is useless as a fighting man?"

"Yes, I'm afraid so. He is rather a timorous creature."

"And my plucky little Tibetan--I'd be glad to think he might make one of us. But this is all guess-work: we can only be sure of six or seven. Obviously six or seven can't tackle two or three hundred well-fed Chinamen and some scores of negritos. Mackenzie has perhaps discovered the way down into the rift, and means us to slip off in the dark. Guess-work again! Let us leave all that. Take a good sleep; then tighten your belt, and ply that bit of iron to bore our passage. Please the Powers, we'll worm our way into God's air before twenty-four hours are up."

With no means of telling the time, Forrester slept brokenly, and was at work long before day had dawned above. To guard against danger from the falling earth, he got Wing Wu to demolish the sentry-box, and lay the material in gridiron pattern across the covering of the pit. Then, mounting into the chimney, he prised out the clay bit by bit, and afterwards the crumbling earth above it, cutting the hole to the shape of a narrow cone.

As the work progressed, the sound of running water grew more and more distinct. Forrester knew that if the bed of the stream were pierced, there would be a swift end to their tribulations. He could only hope for the best, and persevere. How long he worked he never knew; so much engrossed was he that he did not remember he had had no food. There was no sign of interruption. Beresford remained on guard in the outer cavern, listening for the footsteps of the Old Man's minions, the ministers of the Law of the Eye. But not a sound was heard from the direction of the lake. It seemed that the Old Man was content to bide his time.

It was a blissful moment when Forrester, thrusting the iron upwards into the earth, felt suddenly that there was no resistance. When he withdrew it, a thin slit of white light appeared at the apex of the cone. He had pierced the surface, and a great joy thrilled him, for he knew that he had not touched the stream. But he was instantly aware of a double danger. The hole, small as it was, might be seen. Even if it were not seen, a chance passer-by might tread upon it and break through. Would Fortune, he wondered, stand their friend? Nothing more, at any rate, could be risked while daylight lasted.