Truly the occasion makes the man, for Orme rose to it in a way that I can only call heroic. When he was not actually in the tunnel he was labouring at his calculations, of which many must be made, or taking levels with such instruments as he had. For if there proved to be the slightest error all this toil would be in vain, and result only in the blowing of a useless hole through a mass of rock. Then there was a great question as to the effect which would be produced by the amount of explosive at his disposal, since terrible as might be the force of the stuff, unless it were scientifically placed and distributed it would assuredly fail to accomplish the desired end.

At last, after superhuman efforts, the mine was finished. Our stock of concentrated explosive, about four full camel loads of it, was set in as many separate chambers, each of them just large enough to receive the charge, hollowed in the primæval rock from which the idol had been hewn.

These chambers were about twenty feet from each other, although if there had been time to prolong the tunnel, the distance should have been at least forty in order to give the stuff a wider range of action. According to Oliver’s mathematical reckoning, they were cut in the exact centre of the base of the idol, and about thirty feet below the actual body of the crouching sphinx. As a matter of fact this reckoning was wrong in several particulars, the charges having been set farther toward the east or head of the sphinx and higher up in the base than he supposed. When it is remembered that he had found no opportunity of measuring the monument which practically we had only seen once from behind under conditions not favourable to accuracy in such respects, or of knowing its actual length and depth, these trifling errors were not remarkable.

What was remarkable is that his general plan of operations, founded upon a mere hypothetical estimate, should have proved as accurate as it did.

At length all was prepared, and the deadly cast-iron flasks had been packed in sand, together with dynamite cartridges, the necessary detonators, electric wires, and so forth, an anxious and indeed awful task executed entirely in that stifling atmosphere by the hands of Orme and Quick. Then began another labour, that of the filling in of the tunnels. This, it seems, was necessary, or so I understood, lest the expanding gases, following the line of least resistance, should blow back, as it were, through the vent-hole. What made that task the more difficult was the need of cutting a little channel in the rock to contain the wires, and thereby lessen the risk of the fracture of these wires in the course of the building-up process. Of course, if by any accident this should happen, the circuit would be severed, and no explosion would follow when the electric battery was set to work.

The arrangement was that the mine should be fired on the night of that full moon on which we had been told, and spies confirmed the information, the feast of the marriage of Barung’s daughter to my son would be celebrated in the city of Harmac. This date was fixed because the Sultan had announced that so soon as that festivity, which coincided with the conclusion of the harvest, was ended, he meant to deliver his attack on Mur.

Also, we were anxious that it should be adhered to for another reason, since we knew that on this day but a small number of priests and guards would be left in charge of the idol, and my son could not be among them. Now, whatever may have been the views of the Abati, we as Christians who bore them no malice did not at all desire to destroy an enormous number of innocent Fung, as might have happened if we had fired our mine when the people were gathered to sacrifice to their god.

The fatal day arrived at last. All was completed, save for the blocking of the passage, which still went on, or, rather, was being reinforced by the piling up of loose rocks against its mouth, at which a hundred or so men laboured incessantly. The firing wires had been led into that little chamber in the old temple where the dog Pharaoh tore out the throat of Shadrach, and no inch of them was left unguarded for fear of accident or treachery.

The electric batteries—two of them, in case one should fail—had been tested but not connected with the wires. There they stood upon the floor, looking innocent enough, and we four sat round them like wizards round their magic pot, who await the working of some spell. We were not cheerful; who could be under so intense a strain? Orme, indeed, who had grown pale and thin with continuous labour of mind and body, seemed quite worn out. He could not eat nor smoke, and with difficulty I persuaded him to drink some of the native wine. He would not even go to look at the completion of the work or to test the wires.

“You can see to it,” he said; “I have done all I can. Now things must take their chance.”