"It seems a splendid proposal," cried Jim, who had been listening attentively. "I notice that the floor here is also paved with slabs of stone, but the earth beneath is soft, and quite loose, as you will see for yourself if you look at this large patch here, where the covering has been removed. That being the case, the sword which I took from the sentry who was watching over father's prison should be sufficient to thoroughly turn it up, and the remainder of the work can be finished with our hands. If we were to set to at it now, the job would be finished by daylight, and then all would be in readiness in case of attack."
For some little time the fugitives stood thoughtfully considering the question, and then, taking care that the torches should not be brought too close to the entrance, they went there in a body and closely inspected the ground. Thrusting the long native sword into a crevice between two of the paving-slabs, the colonel rapidly levered one of them up, and lifted it out of its place. Then he put the point of the weapon upon the bare earth, and pressed firmly upon the handle, with the result that the blade sank into it easily until the hilt stopped its farther descent. A gentle tug released it, and, when it was held up to the light, they saw that it was not even stained.
"We're in luck!" cried the colonel. "The soil beneath is composed of pure sand, and can be removed with the greatest ease. Look here!"
Dropping upon his knees, he thrust his hands into the opening which he had made and drew them out filled with shining particles.
"That explains the reason for these slabs, and for the paved road outside," he said; "for if they were not here, movement would have become most difficult, and the slaves, as they trudged to and fro with their bags of quartz or of gold-bearing sand, would have had a weary time indeed. Let us get to work at once, for the sooner the task is finished, the better."
Placing their weapons upon the pavement close at hand, the party at once began to tear up the square slabs of stone. They found that, when one had been removed, the rest gave little trouble, and ere many minutes had passed they had cleared a long and narrow track across the opening of the mine. Then they began to shovel out handfuls of sand, and did not desist from their labour until a deep trench had been dug. And now, at Jim's suggestion, the slabs were relaid at the bottom, while a few were used as a narrow coping on the summit of the bank which they had thrown up in front of the trench. Through this four narrow embrasures were left to accommodate the muzzles of the guns, and were cut so deeply that the weapons could be fired whilst the heads of the defenders remained completely under cover.
Two hours later the arched opening became more visible, and soon the rays of the sun were pouring down upon the land.
"I vote for a meal," sang out the colonel cheerily. "We may as well have it now, while we are undisturbed, for we may not have the opportunity later, and besides, you remember the old tale that men fight better and more bravely when they have had all their wants satisfied."
Nothing loth, for their exertions during the night had sharpened their appetites, the remainder of the party hastily agreed, and turned with questioning eyes towards Ali Kumar. The shikari was by no means disconcerted, and instantly crossing the entrance of the mine to where the camels lay, he returned with one of the saddle-bags, in which was stored the greater portion of the food which he and Jim had thoughtfully brought from the zareba.
The fugitives had barely done justice to the meal when a low cry from Ali alarmed them, and, looking out through their embrasures, they caught sight of a group of dusky figures standing at the mouth of the ravine. That their eyes were fixed upon the old mine-workings was evident, and soon there was little doubt that the sight had attracted their attention. They remained close together, talking and waving their arms, and then, to the consternation of the defenders, they were seen to be searching for marks upon the ground. That success was likely to attend their efforts was without question, and indeed but a little time had elapsed before one of them gave vent to a shout, and called to his comrades to join him. An instant later the party separated, scrambling like so many monkeys up the steep slopes of the tiny valley, and, when they arrived at the top, each man instantly began to wave his arms aloft, and shout the news of the discovery to all who were within hearing.