Dr. Bird was suddenly silent.
"I am glad you comprehend my plan so readily, Doctor. Yes, indeed, Mr. Carnes knows that I have captured you. He knows the exact location of this cavern and, more important, he knows the location of the power line which feeds my device when it is in operation. He also knows that there is stored in this cavern, fifty pounds of radite, your ultra-explosive. He knows that you are chained close to the explosive and that it is rigged with a detonator, connected with the power line. In only one thing is he in error.
"He thinks, that if he can sever the power line before he attempts to penetrate the cavern, that the charge will be rendered harmless, and that you will be safe. In point of fact, the charge is set with an interrupter detonator which will explode as soon at the power line is severed. It pleases my sense of humor that it will be the hand of your faithful friend, Carnes, that will send you in fragments to eternity."
Beads of sweat shone on Dr. Bird's head as the Russian finished his speech, but his expression of amused interest did not change. Neither did his voice, when he spoke, betray any nervousness.
"And I presume that Carnes is also to be blown into bits by the explosion?" he asked.
"No, indeed, Doctor, that would frustrate one of the most humorous angles of the whole affair. He will cut the line at the base of a large rock, some two hundred yards from here, far enough away that he will not be seriously injured by the force of the explosion. Thus he will witness the explosion and realize what he has done. In order to be sure that he knows, as soon as he cuts the wire, my men will capture him. I, personally, will tell him of it. I wish to see his face when he realizes what he has unwittingly done."
"Then, I presume, you'll kill him?"
"I doubt it. I rather think I'll let him live. He should be useful to me."
"Carnes will never work for you!"