But even all this was the secondary part of the purpose for which the _Prometheus_ had been fitted. Bert and Alice followed a narrow catwalk to a compartment along the keel of the ship which was fitted like a huge bomb-bay. And the monster that rested there, gripped by mechanically operated claws, would certainly have fitted the definition of a bomb as well as anything that had ever been made by Earth-science. Child, it was, of the now ancient H-bomb.
It was a tapered cylinder, a hundred feet long and thirty feet thick. For one grim, devilish moment Bert Kraskow paused to pat its flank, to feel the solid metallic slap of its tremendous shellcase under his palm, to be aware of the intricacies of its hidden parts: The forklike masses of fissionable metals that could dovetail and join instantly; the heavy-water, the lead, the steel, the beryllium.
Here was watchlike perfection and delicacy of mechanism--precision meant to function faultlessly for but a fragment of a second, and then to perish in a mighty and furious fulfillment. Here was the thought of man crystallized--trying to tread a hairline past inconceivable disaster, to the realization of a dream that was splendid.
In that moment this thing seemed the answer to all the fury of wrong and sorrow that burned in Bert Kraskow. And the vision soared in his mind like a legend of green fields and light. For a few seconds he was sure, until doubt crept up again from the bottom of his brain, and until Alice put that uncertainty into words.
"Doc is gone," she said. "Even with his expert help, using the Big Pill would be taking a chance. Bert, do you think we can do it alone? Will it be all right? Are you certain, Bert?"
Her large, dark eyes pleaded for reassurance.
He sighed as the strain plucked at his nerves, in spite of what he knew of Doc Kramer's careful small-scale tests. Maybe what he felt was just a normal suspicion of anything so new and so colossal.
"No, Allie, not _absolutely_ certain," he replied. "But how can anybody ever be sure of anything unless they try it? Doc died for an idea that holds tremendous hope for the good of all people who make their living in space. He was the principal inventor, and much more than just the boss of a new company. We aren't going to let him down. What we're going to do is for Nick, and for everybody who ever died violently on near-dead worlds. Lauren, and what he stands for, won't stop us. We can radio another warning and instruct everyone on Titan to blast off for a while."
Alice seemed to draw confidence from her husband's words. She smiled a bit wanly. "Okay, Bert," she said. "This is also for the folks who have gone nuts, or have just gotten terribly homesick from seeing too much black sky of space for too long. Let's go!"
They strapped themselves to the seats in the _Prometheus_' control room. Bert depressed the throttle. Rocket jets flamed. The rebuilt freighter lifted heavily and gained momentum toward a speed of miles per second. In the rear-vision screen the Kraskows saw two police spaceboats flashing the blue signal for them to land.
Bert set the _Prometheus_ in an orbit around Titan, about a thousand miles above the bleak and dried out surface of this Saturnian satellite. Thus the ship became a little moon of a moon.
Alice was shouting into the mike of the large radio transmitter: "Colonists at Camp Titan! Enter your ship! Blast into space for safety! We are about to use the Big Pill! Colonists at Camp Titan! Blast for safety!... Police boats, give us room! Don't interfere!..."
This was the start of wild drama. When Alice switched from transmission to reception, the calls from the patrol craft were stern: "Freighter _Prometheus_, this is the Space Patrol. Proceed to a landing or we blast."
But these calls still seemed secondary, compared to other words also coming from the receiver, like another, overlapping radio program. It was Trenton Lauren's scared voice that spoke:
"Space Colonists' Supply, Incorporated, calling deep-space units of patrol! Send more help to Titan! Maniac named Kraskow amuck with freighter _Prometheus_, known to contain huge bomb! Destroy on sight: Bomb supposed to be invention of group headed by one, Emil Kramer, renegade scientist believed to have a grudge against S. C. S. Claims for invention wholly extravagant and unbased. Hurry, deep-space units of Patrol. More help! Or all of Titan will be flooded with heat and deadly radioactivity! Hurry.... Hurry.... Hurry...."
Just then the _Prometheus_ rocked from the impact of a blaster-beam; and though the Kraskows could not see the effect of the weapon, they knew that there were glowing spots on their ship's tough hull. If the Patrol boats could bear down with their beams on a particular area for a few seconds, a mighty episode could end violently before it had a chance to start.
Alice's small hands were on the complicated aiming and firing mechanism of the heavy blaster, mounted externally on the hull of the _Prometheus_.
"I'll keep the cops at a distance with a few near-misses," she said. "Maybe they aren't too anxious to take the chance of setting off the Big Pill, anyway. Let me worry about them, Bert. Just do what you've got to do...."
They had shut off their radio. There was no need to listen to the somewhat hysterical repetitions of what had come through before.
Every few moments there was a burst of humming sound as Alice fired. Bert put additional power into the rockets to surpass fixed orbital speed; but he held the ship to a tight curve around Titan. It was best to cover distance as quickly as possible. In his speeding course, he passed almost over the camp. But his purpose was to bomb a point at antipodes from it, halfway around this Saturnian moon.
* * * * *
Under full acceleration, the _Prometheus_ was soon nearing this destination. To allow for the Big Pill's forward motion, imparted to it by the ship's velocity even after release, he pressed the lever that opened the bomb-bay doors, and then jabbed the single button that controlled both release, and the firing of the gigantic missile's own propulsive jets. Without those jets, considering the centrifugal force of its vast velocity in a circular path around Titan, much overbalancing the feebler gravitational pull of the moon, it could not have started its fall at all. It needed jets to drive it down.
Bert jabbed the button with his eyes closed since he had no precise target to hit. His teeth were gritted.
With the sudden loss of mass, the ship lurched. Bert had to struggle for a moment to adjust the angle of its flaming stern-jets, and bring it back on course. In another few seconds he cut the stern-jets out entirely, and opened the fore-nozzles wide to check excess speed, and reestablish the _Prometheus_ in a stable orbit around Titan. One that could last forever without additional thrust.
"Well, the Big Pill is on its way--for better or worse," Alice remarked. "Half of our job is done."
But time had to pass before that metal colossus could drive itself and fall the thousand miles to the bleak, dried-out hills below. And the space ship hurtled on, to leave the point of coming impact far beyond the horizon. This, the Kraskows knew, was fortunate for them. The solid bulk of Titan would be the shield between them and holocaust. No human eyes could have looked directly on such a holocaust, at a range of a mere thousand miles, and not be burned from their sockets.
Bert and Alice noticed that the Space Patrol craft were no longer pursuing them. Alice switched on the radio again but only jangled sounds came through.
"Now for the last half of our job, Allie," Bert said. "First we attach shoulder-pack jets to our spacesuits."
This was accomplished a few seconds before the stupendous flash of the Big Pill's explosion blazed beyond the horizon. The dark curve of Titan's bulk was limned against thin white fire that streamed outward toward the stars like comet's hair. The spectacle looked like a much-enlarged color-photo of a segment of a solar eclipse. The glare on the other side of Titan was so intense and far-reaching that the night-portions of huge Saturn and his other satellites, and the shadowed part of the fabulous, treasure-filled Rings, all hundreds of thousands