She was shaking her head. I protested, "But the—the quotas, Rena. The Company tracks every milligram of fissionable material from the moment it leaves the reactor! The inspections! Expediters with Geiger counters cover every city in the world!"
"Not here, Tom. You remember that the Sicilians bombed Vesuvius? There is a high level of radioactivity all up and down the mountain. Not enough to be dangerous, but enough to mask a buried bomb." She closed her eyes. "And—well, you are right, Tom. I might as well tell you. In that same war, you see, there was a bomb that did not explode. You recall?"
"Yes, but—"
"But it couldn't explode, Tom. It was a dummy. Slovetski is a brilliant man. Before that bomb left the ground, he had diverted it. What went up was a hollow shell. What is left—the heart of the bomb—is buried forty feet beneath us."
I stared at her, the room reeling. I was clutching at straws. I whispered, "But that was only a fission bomb, Rena. Slovetski—I heard him—he said a Thousand-kiloton bomb. That means hydrogen, don't you see? Surely he hasn't tucked one of those away."
Rena's face was an agony of regret. "I do not understand all these things, so you must bear with me. I know this; there has been secret talk about the Milanese generators, and I know that the talk has to do with heavy water. And I am not stupid altogether, I know that from heavy water one can get what is used in a hydrogen bomb. And there is more, of course—lithium, perhaps? But he has that. You have seen it, I think. It is on a pedestal in this building."
I sat down hard. It was impossible. But it all fell into place. Given the fissionable core of the bomb—plus the deuterium, plus the lithium-bearing shell—it was no great feat to put the parts together and make a Hell-bomb.
The mind rejected it; it was too fantastic. It was frightful and terrifying, and worst of all was that something lurking at the threshold of memory, something about that bomb on display in the museum....
And, of course, I remembered.
"Rena!" I said, struggling for breath. I nearly could not go on, it was too dreadful to say. "Rena! Have you ever looked at that bomb? Have you read the placard on it? That bomb is cobalt!"