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creatures who made the plastic objects. Maybe we ought to try to open communication with their masters. Why should we fight? If we prove we can defend ourselves...."

"I suspect," said Terry, "that all intelligent beings think the same way, intelligently. If we landed on another planet, on some part of that planet that the natives didn't use but we could, it wouldn't be sensible for those natives to welcome us! Trade with us, perhaps. But let us settle down, no!"

There was a bomb explosion out at sea. A plane had dropped a hundred-pound bomb on a monster at the surface. The flattop was now distinct. Golden, almost horizontal sunlight struck upon it. Off to the west a plane dived steeply, something dropped from it, and the plane levelled off. A three-hundred-foot fountain erupted from the surface. Then there came absolute proof that intelligence lay behind all this. It was not human intelligence, to be sure. Men are tool-using creatures nowadays. They imagine robots for fighting, and nowadays they make them, but many centuries ago men ceased to try to use animals as combatants in war.

The creatures under the sea had not. They'd send up giant squids to do battle with men, as men once sent elephants against the Macedonian army. It was na�ve. But the generals, the tacticians, the strategists of the Deep did not remain wedded to the one weapon. Already, they saw that beasts could be fought by men. So their instruments of battle changed. Doubtless, orders were given, and five miles under the sea something—something men could not have duplicated—began the transformation of seawater into gas, in quantities past imagining. Tiny, tiny bubbles were produced by some unguessable engine, and rose toward the surface, in a steady stream. At the bottom they were under a pressure of tons to the square inch. But the pressure lessened as they rose, and as they rose they swelled. A bubble which was pinhead-size at the sea-bed grew to be the size of a basketball a half-mile up, and would have been the size of a house a mile up, except that then it separated into smaller ones. They rose and rose and expanded and separated. Five miles up from their origin, at little more than atmospheric pressure, they made a rising column of insubstantiality. At the surface they became foam. But under the foam there was more foam, and under that still more. A ship sailing from normal ocean water into such airy stuff would drop like a stone into the miles-long cone of semi-nothingness. Nothing solid could float there. Nothing substantial could rest its weight upon such rushing thistledown.

And the first of the bubble-weapons appeared at the surface in the form of a patch of foam. Its source—and hence the place of its appearance—could be moved. It could be shifted under any ship, though there would be a time-interval, always, before the foam at the surface was exactly above the gas-generating engine below. It could be moved to anticipate the movements of a ship. But there was always that time-lag.

The Esperance headed back toward the heap of monsters at the break in the reef. Other giant squids emerged and joined the pack. A plane came over and bombed it. The Esperance turned away. The mine layer from Manila appeared at the horizon. The flattop made a sudden violent turn, and more foam appeared upon the water. It curled and writhed and piled up to be ten—twenty—thirty yards in height.

The flattop fired a shell into it. There was a gigantic flash and flame, and for an instant there was no foam, but only peculiarly pock-marked ocean surface, instantly covered by more foam which piled up as before.

"Gas," said Terry grimly. "Hydrogen. You guessed right, Deirdre!"

Now the flattop shot off plane after plane, as if they were projectiles. They swung in the air and flew low to drop bombs in the now wabbling, moving, sweeping patch of white stuff. It was a huge discoloration of the ocean surface. It was almost in diameter as the flattop's length. Now the carrier dodged it warily.

There were dull concussions everywhere. Giant squids writhed in death-agonies. White foam-patches appeared here and there—but somehow haphazardly—as if fumbling for the ships. One patch swept close to La Rubia, and that small derelict seemed to tremble. And then the fishing boat touched the very edge of the white stuff, and was engulfed in it. She vanished instantly, as if she had fallen into a hole in the sea. When the foam-patch passed on, the sea was empty.

The effect of the foam, actually, was that of a gigantic, slavering, blind gullet straining to devour. It moved erratically over the surface. Terry called to Deirdre, "Have Nick tell the flattop that the foam only comes up from deep water. If they can get inside the hundred-fathom curve they're safe! Maybe even five hundred. Maybe more. But the foam only comes up from deep water!"

The mine layer came on from the horizon at topmost speed. Apparently, they had received warning from the carrier, because the ship suddenly began to zig-zag. The carrier itself adopted the unpredictable change-of-course system which had been originally designed to frustrate submarines lying in wait. Both ships adopted it just in time. A ravening area of foam appeared directly before the mine layer's bow just as she turned aside. The mine layer dumped a mine. Terry saw it go overboard. But it would have five miles to sink before it hit bottom.

Terry called Davis and jerkily explained that the mines would have to be armed when they went overboard—set so that they would explode when they hit bottom. He explained that depth-bombs might be useful against squids, but if they went off at a fixed depth they would be harmless against the enemy which deployed the squids.

The carrier, in the middle of a ninety-degree zig-zag turn, found her bow projecting into a foam-patch. The bow sank deep. The carrier's propellers were out of the water as her bow pointed downward. Had the foam stayed still for two seconds, the carrier would have slid into the column of gigantic ascending bubbles and plunged to destruction. But the foam swerved sidewise.

The carrier escaped, and was infinitely cautious after that. She made short, swift, unpredictable dashes this way and that.... Her anti-aircraft guns rumbled and rattled at things upon the surface. Presently, her depth-finder discovered an underwater extension of the island's mountain-foundation, and the ship took refuge where the water was less than a hundred fathoms deep. There she lay, shooting off planes and retrieving them, her guns flashing at whatever targets appeared.

Twice, as it happened, snaky, monstrous arms flung themselves up and heaved at the flattop as if the giant squids hoped to overturn even an aircraft carrier by their weight. But those arms were blasted to nothingness. The only damage they did was that a twenty-foot section of tentacle—writhing independently on the flight-deck—broke the landing-gear of a returning plane which collided with it.

The mine layer ploughed across the sea. From time to time she heaved something overboard. Nothing seemed to happen. But each mine was, nevertheless, so adjusted that it could explode any time it touched something underwater. They did not allow the usual time so that the mine layer could get away. The mine layer had ample time, because the mines had to go slowly spinning down five long miles to the bottom of the Luzon Deep.

Twenty mines went down before the first one detonated. The concussion was felt on the Esperance, twenty-seven thousand feet up and in shallow water. Then another, and another, and another. The mine layer continued to sow her destructive seed. Far behind her, a monstrous spouting of gas and spume rose up hundreds of feet. There was another concussion, and another....

The Esperance quivered, and Terry said grimly to Deirdre, "We set off five pounds of explosive down the Deep, and the bathyscaphe returned all smashed. What will the creature do now? I wish we could get some mines down to the bottom there!"

Davis came up, beaming—but shaking.

"The carrier's sending some planes down to drop eggs at the spot where the fish were dragged down!" he said zestfully.

Gigantic, terrifying masses of gas leaped skyward where the gases released by the exploding mines finally reached the surface. The mine layer zig-zagged, and dropped a mine. She zig-zagged again, and dropped another. Presently, she took refuge beside the carrier. The Esperance drove over and came to a stop between the two armed vessels. Someone shouted down by megaphone from the carrier's deck, "What happened to you? What hit your bowsprit?"

Terry shouted back, "You shot those beasts. We've been wrestling with 'em!"

An enormous eruption of gas.... Then the underwater ear began to emit an unprecedented sound. It was a rushing sound, but it was only vaguely like the noise of whatever had come up from the depths last Tuesday night. This was powerful beyond imagining.

"Something's coming up!" roared Terry. "Better alert for a real fight now!"

Deirdre said with a little gasp, "The real creatures are coming up! Terry! The ... things that come in the bolides...."

He said savagely, "They've been shaken up badly by the concussions underwater. They resented five pounds of explosive! There's been four hundred pounds in every mine! If they try to fight after what they've taken down below...."

The rushing sound from underwater was a loud, throbbing hum which had no relationship with the humming sound that drove fish. Two spoutings of gas from mine-explosions shot up. There were more concussions in the water.

Then something broke surface. It was huge, and looked like a rocket. It leaped. No, it dashed upward, toward the sky. It flashed skyward, accelerating as it rose. Something else broke the surface and headed for the heavens. This one was globular.

There were dull concussions coming from far underwater, and more rockets broke surface and shot skyward.

Anti-aircraft guns were fired. Shell-bursts came close, but not close enough. Not less than twenty enormous rockets leaped out of the water and shot up toward the sky. Some observers claimed there were more than thirty. Down to southward, where the bathyscaphe had been crushed, the planes that were dropping mines reported that four other objects broke loose from the ocean and fled for empty space at speeds too great to be estimated.

Terry looked suddenly astonished.

"But ... of course!" he told Deirdre. "When you need high pressure, of course you've got a weakness. You can't take concussions! Anything underwater is completely vulnerable to bombs! Whatever was down there has found out that the natives—we aborigines—have a weapon they can't face. Primitive stuff. Explosives! Chemical explosives! And creatures that can travel between planets and undoubtedly have atomic power and—who knows what else—can't fight back if we drop submarine mines on them!"

A last object broke surface and hurtled skyward. Behind it, deep, deep down, there was a titanic explosion.

"Ah!" said Terry. "That was a time-bomb! They've gone home for good!"

A task force of a private yacht, a fishing boat, a satellite-tracking station, an airplane carrier and a mine layer had driven off an invasion of earth. But the public could not be told that the earth had been invaded. The people who had been involved in this secret adventure had to be satisfied with the realization that they had saved mankind.

After a jubilant dinner Terry and Deirdre sat in the veranda.

Davis came out. He blinked at the night.

"Deirdre? Terry?"

"Here," said Terry.

Davis joined them. They had drawn apart a little.

"Good news by short-wave," said Davis. "Those rockets were picked up by radar. They divided into two groups. One headed sunward. The other headed for deep space. My guess is Venus for one group and Jupiter for the other. They couldn't have come from Mars. But they've gone home. Both groups."

Terry paused, and then said wryly, "Two races! Some of the bolides were bullet-shaped and some were globular. That figures. But two races capable of space travel and both in our own solar system!"

Davis grimaced. "We've been talking about it. Our guess is that the Venus race developed in deep water, and therefore at high pressure. And anything that developed on the solid surface of Jupiter would also be accustomed to extremely high pressure."

Terry nodded. He was not exactly absorbed in what Davis had to say. But he said suddenly, "I make a guess. They didn't want to start a colony here. The sea-bottom here is too cold to be comfortable for the beings from Venus, and far too hot to suit those from Jupiter. But both needed terrific pressure. In order to keep contact with each other, in order to do business, they could have set up a trading post here. To meet and trade. Neither one could take over the earth. When you think of it, we couldn't take over Venus or Jupiter! Maybe that's the answer!"

"Eh?" said Davis.

"We won't have to fight as planets," said Terry, "when we have space-ships like they do. We

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