And Engineer Serko describes enthusiastically the various advantages of the new explosive which, he says, is incontestably superior to any yet invented.
“And what a destructive effect it has,” he adds. “It is analogous to that of the Zalinski shell, but is a hundred times more powerful, and requires no machine for firing it, as it flies through the air on its own wings, so to speak.”
I listen in the hope that Engineer Serko will give away a part of the secret, but in vain. He is careful not to say more than he wants to.
“Has Thomas Roch,” I ask, “made you acquainted with the composition of his explosive?”
“Yes, Mr. Hart—if it is all the same to you—and we shall shortly have considerable quantities of it stored in a safe place.”
“But will there not be a great and ever-impending danger in accumulating large quantities of it? If an accident were to happen it would be all up with the island of—!”
Once more the name of Back Cup was on the point of escaping me. They might consider me too well-informed if they were aware that in addition to being acquainted with the Count d’Artigas’ real name I also know where his stronghold is situated.
Luckily Engineer Serko has not remarked my reticence, and he replies:
“There will be no cause for alarm. Thomas Roch’s explosive will not burn unless subjected to a special deflagrator. Neither fire nor shock will explode it.”
“And has Thomas Roch also sold you the secret of his deflagrator?”
“Not yet, Mr. Hart, but it will not be long before the bargain is concluded. Therefore, I repeat, no danger is to be apprehended, and you need not keep awake of nights on that account. A thousand devils, sir! We have no desire to be blown up with our cavern and treasures! A few more years of good business and we shall divide the profits, which will be large enough to enable each one of us to live as he thinks proper and enjoy life to the top of his bent—after the dissolution of the firm of Ker Karraje and Co. I may add that though there is no danger of an explosion, we have everything to fear from a denunciation—which you are in the position to make, Mr. Hart. Therefore, if you take my advice, you will, like a sensible man, resign yourself to the inevitable until the disbanding of the company. We shall then see what in the interest of our security is best to be done with you!”
It will be admitted that these words are not exactly calculated to reassure me. However, a lot of things may happen ere then. I have learned one good thing from this conversation, and that is that if Thomas Roch has sold his explosive to Ker Karraje and Co., he has at any rate, kept the secret of his deflagrator, without which the explosive is of no more value than the dust of the highway.
But before terminating the interview I think I ought to make a very natural observation to Mr. Serko.
“Sir,” I say, “you are now acquainted with the composition of Thomas Roch’s explosive. Does it really possess the destructive power that the inventor attributes to it? Has it ever been tried? May you not have purchased a composition as inert as a pinch of snuff?”
“You are doubtless better informed upon this point than you pretend, Mr. Hart. Nevertheless, I thank you for the interest you manifest in our affairs, and am able to reassure you. The other night we made a series of decisive experiments. With only a few grains of this substance great blocks of rock were reduced to impalpable dust!”
This explanation evidently applies to the detonation I heard.
“Thus, my dear colleague,” continues Engineer Serko, “I can assure you that our expectations have been answered. The effects of the explosive surpass anything that could have been imagined. A few thousand tons of it would burst our spheroid and scatter the fragments into space. You can be absolutely certain that it is capable of destroying no matter what vessel at a distance considerably greater than that attained by present projectiles and within a zone of at least a mile. The weak point in the invention is that rather too much time has to be expended in regulating the firing.”
Engineer Serko stops short, as though reluctant to give any further information, but finally adds:
“Therefore, I end as I began, Mr. Hart. Resign yourself to the inevitable. Accept your new existence without reserve. Give yourself up to the tranquil delights of this subterranean life. If one is in good health, one preserves it; if one has lost one’s health, one recovers it here. That is what is happening to your fellow countryman. Yes, the best thing you can do is to resign yourself to your lot.”
Thereupon this giver of good advice leaves me, after saluting me with a friendly gesture, like a man whose good intentions merit appreciation. But what irony there is in his words, in his glance, in his attitude. Shall I ever be able to get even with him?
I now know that at any rate it is not easy to regulate the aim of Roch’s autopropulsive engine. It is probable that it always bursts at the same distance, and that beyond the zone in which the effects of the fulgurator are so terrible, and once it has been passed, a ship is safe from its effects. If I could only inform the world of this vital fact!
August 20.—For two days no incident worth recording has occurred. I have explored Back Cup to its extreme limits. At night when the long perspective of arched columns are illuminated by the electric lamps, I am almost religiously impressed when I gaze upon the natural wonders of this cavern, which has become my prison. I have never given up hope of finding somewhere in the walls a fissure of some kind of which the pirates are ignorant and through which I could make
