Chapter VII: Behind the Sealed Door (3)

I might have been looking down any prosperous earthly subdivision, save for the fact that the roofs of the houses were the earth itself, which the building walls, in addition to functioning as partitions, served to support. Also earthly subdivisions aren't usually illuminated with rosy light that comes softly roaring from jets set in the walls.

* * * * *

We were walking toward a more brightly lighted area that showed ahead of us. On the way we passed intersections where other, similar streets branched geometrically away to right and left. These were smaller than the one we were on, indicating that ours was Main Street in this bizarre submarine city.

Faces appeared at door and window openings to peer at me as we passed. And even in that jumbled moment I had time to realize that these folk could restrain curiosity better than we can atop the earth. There was no hub-bub, no running out to tag after the queerly dressed foreigner and shout humorous remarks at him.

We approached the bright spot I had noticed from afar. It was an open square, about a city block in area, in the center of which was a royal looking building covered with blazing fragments of crystal and so brilliantly resplendent with light that it seemed to glow at the heart of a pink fire.

I was led toward this and in through a wide doorway. As courteously as though I were a visiting king, I was conducted up a great staircase, down a corridor set with more of the sparkling crystals and into a huge, low room. There my escort bowed and left me.

* * * * *

Still feeling that I could not possibly be awake and seeing actual things, I glanced around.

In a corner was another of the mattresslike couches made of the thick, soft hide that seemed to be the principal fabric of the place. A few feet away was a table set with dishes of food in barbaric profusion. None of the viands looked familiar but all appealed to the appetite. The floor was strewn with soft skins, and comfortable, carved benches were scattered about.

I walked to the window and looked out. Underneath was a plot of the cream colored grass through which ran a tiny stream. This widened at intervals into clear pools beside which were set stone benches. A hundred yards away was the edge of the square, where the regular, three storied houses began.

While I was staring at this unearthly vista, still unable to think with any coherence. I heard my name called. I turned to face Stanley and the Professor.

* * * * *

Both were pale in the rose light, and Stanley limped with the pain of his bruised leg: but both had recovered from their partial suffocation as completely as had I.

"We thought perhaps you'd decided to swim back up to the _Rosa_ and leave us to our fates," said Stanley after we had stopped pumping each other's arms and had seated ourselves.

"And I thought--well, I didn't think much of anything," I replied. "I was too busy straining my eyesight over the wonders of this city. Did you ever see anything like it?"

"We haven't seen it at all, save for a view from the windows," said Stanley. "All we know of the place is that a while ago we woke up in a room like this, only much smaller and less lavish. I wonder why you rate this distinction?"

I described the streets as I had seen them. (It is impossible for me to think of them as anything but streets; it would seem as though the rock roof over all would give the appearance of a series of tunnels; but I had always the impression of airiness and openness.)

"Light and heat are furnished by natural gas," said the Professor when I remarked on the perfection of these two necessities. "That's what makes the low roaring noise--the thousands of burning jets. But the presence of gas here isn't as unusual as the presence of air. Where does that come from? Through wandering underground mazes, from some cave mouth in the Fiji Islands to the north? That would indicate that all the earth around here is honeycombed like a gigantic section of sponge. I wonder--"

"Have you any idea how we were rescued?" I interrupted, a little impatient of his abstract scientific ponderings.

"We have," said Stanley. "A woman told us. We woke up to find her nursing us--gorgeous looking thing--finest woman I've ever seen, and I've seen a good many--"

"She didn't exactly 'tell' us," remarked the Professor with his thin smile. Women were only interesting to him as biological studies. "She drew a diagram that explained it.

"That tunnel, Martin, was like the outer diving chamber of a submarine. We were hauled in on a big windlass--driven by gas turbines, I think. Once we were inside, a twenty-yard, counterbalanced wall of rock was lowered across the entrance. Then the water was drained out through a well, and into a subterranean body of water that extends under the entire city. And here we are."

We fell silent. Here we were. But what was going to happen to us among these friendly-seeming people; and how--if ever--we were going to get back to the earth's surface, were questions we could not even try to answer.

* * * * *

We ate of the appetizing food laid out on the long table. Shortly afterward we heard steps in the corridor outside the room.

A woman entered. She was ravishingly beautiful, tall, slender but symmetrically rounded. A soft leather robe slanted upward across her breast to a single shoulder fastening and ended just above her knees in a skirt arrangement. Around her head was a regal circlet of silvery gray metal with a flashing bit of crystal set in the center above her broad, low forehead.

She smiled at Stanley who looked dazzled and smiled eagerly back.

She pointed toward the door, signifying that we were to go with her. We did so; and were led down the great staircase and to a huge room that took up half the ground floor of the building. And here we met the nobility of the little kingdom--the upper class that governed the immaculate little city.

They were standing along the walls, leaving a lane down the center of the room--tall, finely modelled men and women dressed in the single garments of soft leather. There were people there with gray hair and wisdom wrinkled faces; but all were alike in being erect of body, firm of bearing and in splendid health.

They stopped talking as we entered the big room. Our gaze strayed ahead down the lane toward the further wall.

Here was a raised dais. On it was a gleaming crystal encrusted throne. And occupying it was the most queenly, exquisitely beautiful woman I had ever dreamed about.

* * * * *

Woman? She was just a girl in years in spite of her grave and royal air. Her eyes were deep violet. Her hair was black as ebony and gleaming with sudden glints of light. Her skin--

But she cannot be described. Only a great painter could give a hint of her glory. Too, I might truthfully be described as prejudiced about her perfections.

The Queen, for patently she was that, bowed graciously at us. It seemed to me--though I told myself that I was an imaginative fool--that her eyes rested longest on me, and had in them an expression not granted to the Professor or Stanley.

She spoke to us a melodious sentence or two, and waved her beautiful hand in which was a short ivory wand, evidently a scepter.

"She's probably giving us the keys to the city," whispered Stanley. He edged nearer the fair one who had conducted us. "I sincerely hope there's room here for us."

The open lane closed in on us. Men and women crowded about us speaking to us and smiling ruefully as they realized we could not understand. I noticed that, for some curious reason, they seemed fascinated by the color of my hair. Red-haired men were evidently scarce there.

At length the beauty who had so captured Stanley's fancy, and who seemed to have been appointed a sort of mentor for us, suggested in sign language that we might want to return to our quarters.

It was a welcome suggestion. We were done in by the experiences and emotions that had gripped us since leaving the _Rosa_ such an incredibly few hours ago.

We went back to the second floor. I to my luxurious big apartment and Stanley and the Professor to their smaller but equally comfortable rooms.

* * * * *

A pleasant period slid by, every waking hour of which was filled with new experiences.

The city's name, we found, was Zyobor. It was a perfect little community. There were artisans and thinkers, artists and laborers--all alike in being physically perfect beyond belief and cultured as no race on top the ground is cultured.

As we began to learn the language, more exact details of the practical methods of existence were revealed to us.

The surrounding earth furnished them with building materials, metals and unlimited gas. The sea, so near us and yet so securely walled away, gave them food. Which warrants a more detailed description.

We were informed that the manlike, two-armed fishes were the servants of these people--domesticated animals, in a sense, only of an extremely high order of intelligence. They were directed by mental telepathy (Every man, woman and child in Zyobor was skilled at thought projection. They conversed constantly, from end to end of the city, by mental telepathy.)

Protected in their spined shells, which they captured from the schools of porcupine fish that swarmed in Penguin Deep, they gathered sea vegetation from the higher levels and trapped sea creatures. These were brought into the subterranean chamber where our glass ball now reposed. Then the chamber was emptied of water and the food was borne to the city.

The vast army of mound-fish provided the bulk of the population's food, and also furnished the thick, pliant skin they used for clothing and drapes. They were cultivated as we cultivate cattle--an ominous herd, to be handled with care and approached by the fish-servants with due caution.

Thus, with all reasonable wants satisfied, with talent and brains to design beautiful surroundings, lighted and warmed by inexhaustible natural gas, these fortunate beings lived their sheltered lives in their rosy underground world.

At least I thought their lives were sheltered then. It was only later, when talking to the beautiful young Queen, that I learned of the dread menace that had begun to draw near to them just a short time before we were rescued....

* * * * *

My first impression, when we had entered the throne room that first day, that the Queen had regarded me more intently than she had Stanley or the Professor, had been right. It pleased her to treat me as an equal, and to give me more of her time than was granted to any other person in the city.

Every day, for a growing number of hours, we were together in her apartment. She personally instructed me in the language, and such was my desire to talk to this radiant being that I made an apt pupil.

Soon I had progressed enough to converse with her--in a stilted, incorrect way--on all but the most abstract of subjects. It was a fine language. I liked it, as I liked everything else about Zyobor. The upper earth seemed far away and well forgotten.

Her name, I found, was Aga. A beautiful name....

"How did your kingdom begin?" I asked her one day, while we were sitting beside one of the small pools in the gardens. We were close together. Now and then my shoulder touched hers, and she did not draw away.

"I know not," she replied. "It is older than any of our ancient records can say. I am the three hundred and eleventh of the present reigning line."

"And we are the first to enter thy realm from the upper world?"

"Thou art the first."

"There is no other entrance but the sea-way into which we were drawn?"

"There is no other entrance."

* * * * *

I was silent, trying to realize the finality of my residence here.

At the moment I didn't care much if I never got home!

"In the monarchies we know above," I said finally, avoiding her violet eyes, "it is not the custom for the queen--or king--to reign alone. A consort is chosen. Is it not so here? Has thou not, among thy nobles, some one thou hast destined--"

I stopped, feeling that if she dismissed me in anger and never spoke to me again the punishment would be just.

But she wasn't angry. A lovely tide of color stained her cheeks. Her lips parted, and she turned her head. For a long time she said nothing. Then she faced me, with a light in her eyes that sent the blood racing in my veins.

"I have not yet chosen," she murmured. "Mayhap soon I shall tell thee why."

She rose and hurried back toward the palace. But at the door she paused--and smiled at me in a way that had nothing whatever to do with queenship.

* * * * *

As the time sped by the three of us settled into the routine of the city as though we had never known of anything else.

The Professor spent most of his time down by the sea chamber where the food was dragged in by the intelligent servant-fish.

He was in a zoologist's paradise. Not a creature that came in there had ever been catalogued before. He wrote reams of notes on the parchment paper used by the citizens in recording their transactions. Particularly was he interested in the vast, lowly mound-fish.

One time, when I happened to be with him, the receding waters of the chamber disclosed the body of one of the odd herdsmen of these deep sea flocks. Then the Professor's elation knew no bounds. We hurried forward to look at it.

"It is a typical fish," puzzled the Professor when we had cut the body out of its usurped armor. "Cold blooded, adapted to the chill and pressure of the deeps. There are the gills I observed before ... yet it looks very human."

It surely did. There were the jointed arms, and the rudimentary hands. Its forehead was domed; and the brain, when dissected, proved much larger than the brain of a true fish. Also its bones were not those of a mammal, but the cartilagenous bones of a fish. It was not quite six feet long; just fitted the horny shell.

"But its intelligence!" fretted the Professor, glorying in his inability to classify this marvelous specimen. "No fish could ever attain such mental development. Evolution working backward from human to reptile and then fish--or a new freak of evolution whereby a fish on a short cut toward becoming human?" He sighed and gave it up. But more reams of notes were written.

"Why do you take them?" I asked. "No one but yourself will ever see them."

* * * * *

He looked at me with professorial absent-mindedness.

"I take them for the fun of it, principally. But perhaps, sometime, we may figure out a way of getting them up. My God! Wouldn't my learned brother scientists be set in an uproar!"

He bent to his observations and dissections again, cursing now and then at the distortion suffered by the specimens when they were released from the deep sea pressure and swelled and burst in the atmospheric pressure in the cave.

Stanley was engrossed in a different way. Since the moment he laid eyes on her, he had belonged to the stately woman who had first nursed him back to consciousness. Mayis was her name.

From shepherding the three of us around Zyobor and explaining its marvels to us, she had taken to exclusive tutorship of Stanley. And Stanley fairly ate it up.

"You, the notorious woman hater," I taunted him one time, "the wary bachelor--to fall at last. And for a woman of another world--almost of another planet! I'm amazed!"

"I don't know why you should be amazed," said he stiffly.

"You've been telling me ever since I was a kid that women were all useless, all alike--"

"I find I was mistaken," he interrupted. "They aren't all alike. There's only one Mayis. She is--different."

"What do you talk about all the time? You're with her constantly."

"I'm not with her any more than you're with the Queen," he shot back at me. "What do you find to talk about?"

That shut me up. He went to look for Mayis; and I wandered to the royal apartments in search of Aga.

* * * * *

In the first days of our friendship I had several times surprised in Aga's eyes a curious expression, one that seemed compounded of despair, horror and resignation.

I had seen that same expression in the eyes of the nobles of late, and in the faces of all the people I encountered in the streets--who, I mustn't forget to add here, never failed to treat me with a deference that was as intoxicating as it was inexplicable.

It was as though some terrible fate hovered over the populace, some dreadful doom about which nothing could be done. No one put into words any fears that might confirm that impression; but continually I got the idea that everybody there went about in a state of attempting to live normally and happily while life was still left--before some awful, wholesale death descended on them.

At last, from Aga, I learned the fateful reason.

But first--a confession that was hastened by the knowledge of the fate of the city--I learned from her something that changed all of life for me.

* * * * *

We were surrounded by the luxury of her private apartment. We sat on a low divan, side by side. I wanted, more than anything I had ever wanted before, to put my arms around her. But I dared not. One does not make love easily to a queen, the three hundred and eleventh of a proud line.

And then, as maids have done often in all countries, and, perhaps, on all planets, she took the initiative herself.

"We have a curious custom in Zyobor of which I have not yet told thee," she murmured. "It concerns the kings of Zyobor. The color of their hair."

She glanced up at my own carrot-top, and then averted her gaze.

"For all of our history our kings have had--red hair. On the few occasions when the line has been reduced to a lone queen, as in my case, the red-haired men of the kingdom have striven together in public combat to determine which was most powerful and brave. The winner became the Queen's consort."

"And in this case?" I asked, my heart beginning to pound madly.

"In my case, my lord, there is to be no--no striving. When I was a child our only two red-haired males died, one by accident, one by sickness. Now there are none others but infants, none of eligible age. But--by a miracle--thou--"

She stopped; then gazed up at me from under long, gold flecked lashes.

"I was afraid ... I was doomed to die ... alone...."

* * * * *

It was after I had replied impetuously to this, that she told me of the terror that was about to engulf all life in the beautiful undersea city.

"Thou hast wonder, perhaps, why I should be forward enough to tell thee this instead of waiting for thine own confession first," she faltered. "Know, then--the reason is the shortness of the time we are fated to spend together. We shall belong each to the other only a little while. Then shall we belong to death! And I--when I knew the time was to be so brief--"

And I listened with growing horror to her account of the enemy that was advancing toward us with every passing moment.

* * * * *

About twenty miles away, in the lowest depression of Penguin Deep, lived a race of monsters which the people of Aga's city called Quabos.

The Quabos were grim beings that were more intelligent than Aga's fish-servants--even, she thought, more intelligent than humans themselves. They had existed in their dark hole, as far as the Zyobites knew, from the beginning of time.

Through the countless centuries they had constructed for themselves a vast series of dens in the rock. There they had hidden away from the deep-sea dangers. They, too, preyed on the mound-fish; but as there was plenty of food for all, the Zyobites had never paid much attention to them.

But--just before we had appeared, there had come about a subterranean quake that changed the entire complexion of matters in Penguin Deep.

The earthquake wiped out the elaborately burrowed sea tunnels of the Quabos, killing half of them at a blow and driving the rest out into the unfriendly openness of the deep.

Now this was fatal to them. They were not used to physical self defense. During the thousands of years of residence in their sheltered burrows they had become utterly unable to exist when exposed to the primeval dangers of the sea. It was as though the civilization-softened citizens of New York should suddenly be set down in a howling wilderness with nothing but their bare hands with which to contrive all the necessities of a living.

* * * * *

Such was the situation at the time Stanley, the Professor and myself arrived in Zyobor.

The Quabos must find an immediate haven or perish. On the ocean bottom they were threatened by the mound-fish. In the higher levels they were in danger from almost everything that swam: few things were so defenceless as themselves after their long inertia.

Their answer was Zyobor. There, in perfect security, only to be reached by the diving chamber that could be sealed at will by the twenty-yard, counterbalanced lock, the Quabos would be even more protected than in their former runways.

So--they were working day and night to invade Aga's city!

"But Aga," I interrupted impulsively at this point. "If these monsters are fishes, how could they live here in air--"

I stopped as my objection answered itself before she could reply.

They would not have to live in air to inhabit Zyobor. They would inundate the city--flood that peaceful, beautiful place with the awful pressure of the lowest depths!

That thought, in turn, suggested to me that every building in Zyobor would be swept flat if subjected suddenly to the rush of the sea. The great low cavern, without the support of the myriad walls, would probably collapse--trapping the invading Quabos and leaving the rest without a home once more.

But Aga answered this before I could voice it.

The Quabos had foreseen that point. They were tunneling slowly but surely toward the city from a point about half a mile from the diving chamber. And as they advanced, they blocked up the passageway behind them at intervals, drilled down to the great underground sea that lay beneath all this section, and drained a little of the water away.

* * * * *

In this manner they lightened, bit by bit, the enormous weight of the ocean depths. When the city was finally reached, not only would it be ensured against sudden destruction but the Quabos themselves would have become accustomed to the difference in pressure. Had they gone immediately from the accustomed press of Penguin Deep into the atmosphere of Zyobor, they would have burst into bits. As it was they would be able to flood the city slowly, without injury to themselves.

"Now thou knowest our fate," concluded Aga with a shudder. "Zyobor will be a part of the great waters. We ourselves shall be food for these monsters...." She faltered and stopped.

"But this cannot be!" I exclaimed, clenching my fists impotently. "There _must_ be something we can do; some way--"

"There is nothing to be done. Our wisest men have set themselves sleeplessly to the task of defence. There is no defence possible."

"We can't simply sit here and wait! Your people are wonderful, but this is no time for resignation. Send for my two friends, Aga. We will have a council of war, we four, and see if we can find a way!"

She shrugged despairfully, started to speak, then sent in quest of Stanley and the Professor.

* * * * *

They as well as myself, had had no idea of the menace that crept nearer us with each passing hour. They were dumbfounded, horrified to learn of the peril. We sat awhile in silence, realizing our situation to the full.

Then the Professor spoke:

"If only we could see what these things look like! It might help in planning to defeat them."

"That can be done with ease," said Aga. "Come."

We went with her to the gardens and approached the nearest pool.

"My fish-men are watching the Quabos constantly. They report to me by telepathy whenever I send my thoughts their way. I will let you see, on the pool, the things they are now seeing."

She stared intently at the sheet of water. And gradually, as we watched, a picture appeared--a picture that will never fade from my memory in any smallest detail.

The Quabos had huddled for protection into a large cave at the foot of the cliff outside Zyobor. There were a great many Quabos, and the cave was relatively confining. Now we saw, through the eyes of the spine protected outpost of the Queen, these monstrous refugees crowded together like sheep.

The watery cavern was a creeping mass of viscous tentacles, enormous staring eyes and globular heads. The cave was paved three deep with the horrible things, and they were attached to the it walls and roof in solid blocks.

"My God!" whispered Stanley. "There are thousands of them!"

* * * * *

There were. And that they were in distress was evident.

The layers on the floor were weaving and shifting constantly as the bottom creatures struggled feebly to rise to the top of the mass and be relieved of the weight of their brothers. Also they were famished....

One of the blood red, gigantic worms floated near the cave entrance. Like lightning the nearest Quabos darted after it. In a moment the prey was torn to bits by the ravenous monsters.

The other side of the story was immediately portrayed to us.

With the emerging of the reckless Quabos, a sea-serpent appeared from above and snapped up three of their number. Evidently the huge serpent considered them succulent tidbits, and made it its business to wait near the cave and avail itself of just such rash chance-taking as this.

While we watched the nightmare scene, a Quabo disengaged itself from the parent mass and floated upward into the clear, giving us a chance to see more distinctly what the creatures looked like.

There was a black, shiny head as large as a sugar barrel. In this were eyes the size of dinner plates, and gleaming with a cold, hellish intelligence. Four long, twining tentacles were attached directly to the head. Dotted along these were rudimentary sucker discs, that had evidently become atrophied by the soft living of thousands of the creature's ancestors.

As though emerging from the pool into which we were gazing, the monster darted viciously at us. At once it disappeared: the fish-servant through whose eyes we were seeing all this had evidently retreated from the approach; although, protected by its spines, it could not have been in actual danger.

"How dost thou know of the tunneling?" I asked Aga. "Thy fish-men cannot be present there, in the rear of the tunnel, to report."

"My artisans have knowledge of each forward move," she answered. "I will show thee."

* * * * *

We walked back to the palace and descended to a smooth-lined vault. There we saw a great stone shaft sunk down into the rock of the floor. On this was a delicate vibration recording instrument of some sort, with a needle that quivered rhythmically over several degrees of an arc.

"This tells of each move of the Quabos," said Aga. "It also tells us where they will break through the city wall. How near to us are they, Kilor?" she asked an attendant who was studying the dial, and who had bowed respectfully to Aga and myself as we approached.

"They will break into the city in four rixas at the present rate of advance, Your Majesty."

Four rixas! In a little over sixteen days, as we count time, the city of Zyobor would be delivered into the hands--or, rather, tentacles--of the slimy, starving demons that huddled in the cavern outside!

Somberly we followed Aga back to her apartment.

* * * * *

"As thou seest," she murmured, "there is nothing to be done. We can only resign ourselves to the fate that nears us, and enjoy as much as may be the few remaining rixas...."

She glanced at me.

The Professor's dry, cool voice cut across our wordless, engrossed communion.

"I don't think we'll give up quite as easily as all that. We can at least try to outwit our enemies. If it does nothing else for us, the effort can serve to distract our minds."

He drew from his pocket a sheet of parchment and the stub of his last remaining pencil. His fingers busied themselves apparently idly in the tracing of geometric lines.

"Looking ahead to the exact details of our destruction," he mused coolly, "we see that our most direct and ominous enemy is the sea itself. When the city is flooded, we drown--and later the Quabos can enter at will."

He drew a few more lines, and marked a cross at a point in the outer rim of the diagram.

"What will happen? The Quabos force through the last shell of the city wall. The water from their tunnel floods into Zyobor. But--and mark me well--_only_ the water from the tunnel! The outer end, remember, is blocked off in their pressure-reducing process. The vast body of the sea itself cannot immediately be let in here because the Quabos must take as long a time to re-accustom themselves to its pressure as they did to work out of it."

He spread the parchment sheet before us.

"Is this a roughly accurate plan of the city?" he asked Aga.

She inclined her lovely head.

"And this," indicating the cross, "is the spot where the Quabos will break in?"

Again she nodded, shuddering.

"Then tell me what you think of this," said the Professor.

* * * * *

And he proceeded to sketch out a plan so simple, and yet so seemingly efficient, that the rest of us gazed at him with wordless admiration.

"My friend, my friend," whispered Aga at last, "thou hast saved us. Thou art the guardian hero of Zyobor--"

"Not too fast, Your Highness," interrupted the Professor with his frosty smile. "I shall be much surprised if this little scheme actually saves the city. We may find the rock so thick there that our task is hopeless--though I imagine the Quabos picked a thin section for help in their own plans."

A vague look came into his eyes.

"I must certainly get my hands on one of these monsters ... superhumanly intelligent fish ... marvelous--akin to the octopus, perhaps?"

He wandered off, changed from the resourceful schemer to the dreamy man of scientific abstractions.

The Queen gazed after him with wonder in her eyes.

"A great man," she murmured, "but is he--a little mad?"

"No, only a little absent-minded," I replied. Then, "Come on, Stanley. We'll round up every able bodied citizen in Zyobor and get to work. I suppose they have some kind of rock drilling machinery here?"

They had. And they strangely resembled our own rock drills: revolving metal shafts, driven by gas turbines, tipped with fragments of the same crystal that glittered so profusely in the palace walls. Another proof that practically every basic, badly needed tool had been invented again and again, in all lands and times, as the necessity for it arose.

With hundreds of the powerful men of Zyobor working as closely together as they could without cramping each others movements, and with the whole city resounding to the roar of the machinery, we labored at the defence that might possibly check the advance of the hideous Quabos.

And with every breath we drew, waking or sleeping, we realized that the cold blooded, inhuman invaders had crept a fraction of an inch closer in their tunneling.

The Quabos against the Zyobites! Fish against man! Two diametrically opposed species of life in a struggle to the death! Which of us would survive?

* * * * *

The hour of the struggle approached. Every soul in Zyobor moved in a daze, with strained face and fear haunted eyes. Their proficiency in mental telepathy was a curse to them now: every one carried constantly, transmitted from the brains of the servant-fish outposts, a thought picture of that outer cavern in the murky depths of which writhed the thousands of crowding Quabos. Each mind in Zyobor was in continual torment.

Spared that trouble, at least, Stanley and the Professor and I walked down to the fortification we had so hastily contrived. It was finished. And none too soon: the vibration indicator in the palace vault told us that only two feet of rock separated us from the burrowing monsters!

The Professor's scheme had been to cut a long slot down through the rock floor of the city to the roof of the vast, mysterious body of water below.

This slot was placed directly in front of the spot in the city wall where the Quabos were about to emerge. As they forced through the last shell of rock, the deluge of water, instead of drowning the city, was supposed to drain down the oblong vent. Any Quabos that were too near the tunnel entrance would be swept down too.

* * * * *

In silence we approached the edge of the great trough and stared down.

There was a stratum of black granite, fortunately only about thirty feet thick at this point, and then--the depths! A low roar reached our ears from far, far beneath us. A steady blast of ice cold air fanned up against us.

The Professor threw down a large fragment of rock. Seconds elapsed and we heard no splash. The unseen surface was too far below for the noise of the rock's fall to carry on up to us.

"The mystery of this ball of earth on which we live!" murmured the Professor. "Here is this enormous underground body of water. We are far below sea level. Where, then, is it flowing? What does it empty into? Can it be that our planet is honeycombed with such hollows as this we are in? And is each inhabited by some form of life?"

He sighed and shook his head.

"The thought is too big! For, if that were true, wouldn't the seas be drained from the surface of the earth should an accidental passage be formed from the ocean bed down to such a giant river as this beneath us? How little we know!"

* * * * *

The wild clamor of an alarm bell interrupted his musing. From all the city houses poured masses of people, to form in solid lines behind the large well.

In addition to men, there were many women in those lines, tall and strong, ready to stand by their mates as long as life was left them. There were children, too, scarcely in their teens, prepared to fight for the existence of the race. Every able-bodied Zyobite was mustered against the cold-blooded Things that pressed so near.

The arms of these desperate fighters were pitiful compared to our own war weapons. With no need in the city for fighting engines, none had ever been developed. Now the best that could be had was a sort of ax, used for dissecting the mound-fish, and various knives fashioned for peaceful purposes.

Again the bell clamored forth a warning, this time twice repeated. Every hand grasped its weapon. Every eye went hopefully to the hole in the floor on which our immediate fate depended, then valiantly to the section of wall above it.

This quivered perceptibly. A heavy, pointed instrument broke through; was withdrawn; and a hissing stream of water spurted out.

The Quabos were about to break in upon us!

* * * * *

With a crash that made the solid rock tremble, a section of the wall collapsed. It was the top half of the end of the Quabos' tunnel. They had so wrought that the lower half stayed in place--a thing we did not have time to recognize as significant until later.

A solid wall of water, in which writhed dozens of tentacled monsters, was upon us, and we had time for nothing but action.

The ditch had of necessity been placed directly under the Quabos' entrance. The first rush of water carried half over it. With it were borne scores of the cold-blooded invaders.

In an instant we were standing knee deep in a torrent that tore at our footing, while we hacked frantically with knives and axes at the slimy tentacles that reached up to drag us under.

A soft, horrible mass swept against my legs. I was overthrown. A tentacle slithered around my neck and constricted viciously like a length of rotten cable. I sawed at it with the long, notched blade I carried. Choking for air, I felt the pressure relax and scrambled to my knees.

Two more tentacles went around me, one winding about my legs and the other crushing my waist. Two huge eyes glared fiendishly at me.

I plunged the knife again and again into the barrel-shaped head. It did not bleed: a few drops of thin, yellowish liquid oozed from the wounds but aside from this my slashing seemed to make no impression.

In a frenzy I defended myself against the nightmare head that was winding surely toward me. Meanwhile I devoted every energy to keeping on my feet. If I ever went under again--

It seemed to me that the creature was weakening. With redoubled fury I hacked at the spidery shape. And gradually, when it seemed as though I could not withstand its weight and crushing tentacles another second, it slipped away and floated off on the shallow, roaring rapids.

* * * * *

For a moment I stood there, catching my breath and regaining my strength. Shifting, terrible scenes flashed before my eyes.

A tall Zyobite and an almost equally stalwart woman were both caught by one gigantic Quabo which had a tentacle around the throat of each. The man and woman were chopping at the viscous, gruesome head. One of the Thing's eyes was gashed across, giving it a fearsome, blind appearance. It heaved convulsively, and the three struggling figures toppled into the water and were swirled away.

The Professor was almost buried by a Quabo that had all four of its tentacles wound about him. As methodically as though he were in a laboratory dissecting room, he was cutting the slippery lengths away, one by one, till the fourth parted and left him free.

A giant Zyobite was struggling with two of the monsters. He had an ax in each hand, and was whirling them with such strength and rapidity that they formed flashing circles of light over his head. But he was torn down at last and borne off by the almost undiminished flood that gushed from the tunnel.

And now, without warning, a heavy soft body flung against my back, and the accident most to be dreaded in that mêlée occurred.

I was knocked off my feet! My head was pressed under the water. On my chest was a mass that was yielding but immovable, soft but terribly strong. Animated, firm jelly! I had no chance to use my knife. My arms were held powerless against my sides.

Water filled my nose and mouth. I strangled for breath, heaving at the implacable weight that pinned me helpless. Bright spots swirled before my eyes. There was a roaring in my ears. My lungs felt as though filled with molten lead. I was drowning....

* * * * *

Vaguely I felt the pressure loosen at last. An arm--with good, solid flesh and bone in it--slipped under my shoulders and dragged me up into the air.

"Don't you know--can't drown a fish--holding it under water?" panted a voice.

I opened my eyes and saw Stanley, his face pale with the thrill of battle, his chin jutting forward in a berserk line, his eyes snapping with eager, wary fires.

I grinned up at him and he slapped me on the back--almost completing the choking process started by the salt water I'd inhaled.

"That's better. Now--at it again!"

I don't remember the rest of the tumult. The air seemed filled with loathsome tentacles and bright metal blades. It was a confused eternity until the decreased volume of water in the tunnel gave us a respite....

As the tunnel slowly emptied the pressure dropped, and the incoming flood poured squarely into the trough instead of half over it. From that moment there was very little more for us to do.

Our little army--with about a fourth of its number gone--had only to guard the ditch and see that none of the Quabos caught the edges as they hurtled out of their passage.

For perhaps ten minutes longer the water poured from the break in the wall, with now and then a doomed Quabo that goggled horribly at us as it was dashed down the hole in the floor to whatever awesome depths were beneath.

Then the flow ceased. The last oleaginous corpse was pushed over the edge. And the city, save for an ankle-deep sheet of water that was rapidly draining out the vents in the streets, presented its former appearance.

The Zyobites leaned wearily against convenient walls and began telling themselves how fortunate they were to have been spared what seemed certain destruction.

* * * * *

The Professor didn't share in the general feeling of triumph.

"Don't be so childishly optimistic!" he snapped as I began to congratulate him on the victory his ditch had given us. "Our troubles aren't over yet!"

"But we've proved that we can stand up to them in a hand-to-tentacle fight--"

His thin, frosty smile appeared.

"One of those devils, normally, is stronger than any three men. The only reason all of us weren't destroyed at once is that they were slowly suffocating as they fought. The foot and a half of water we were in wasn't enough to let their gills function properly. Now if they were able to stand right up to us and not be handicapped by lack of water to breathe ... I wonder.... Is that part of their plan? Is there any way they could manage ...?"

"But, Professor," I argued, "it's all over, isn't it? The tunnel is emptied, and all the Quabos are--"

"The tunnel isn't emptied. It's only _half_ emptied! I'll show you."

He called Stanley; and the three of us went to the break.

"See," the Professor pointed out to us as we approached the jagged hole, "the Quabos only drilled through the top half of their tunnel ending. That means that the tunnel still has about four feet of water in it--enough to accommodate a great many of the monsters. There may be four or five hundred of them left in there; possibly more. We can expect renewed hostilities at any time!"

"But won't it be just a repetition of the first battle?" remonstrated Stanley. "In the end they'll be killed or will drown for lack of water as these first ones did."

* * * * *

The Professor shook his head.

"They're too clever to do that twice. The very fact that they kept half their number in reserve shows that they have some new trick to try. Otherwise they'd all have come at once in one supreme effort."

He paced back and forth.

"They're ingenious, intelligent. They're fighting for their very existence. They must have figured out some way of breathing in air, some way of attacking us on a more even basis in case that first rush went wrong. What can it be?"

"I think you're borrowing trouble before it is necessary--" I began, smiling at his elaborate, scientific pessimism. But I was interrupted by a startled shout from Stanley.

"Professor Martin," he cried, pointing to the tunnel mouth. "Look!"

Like twin snakes crawling up to sun themselves, two tentacles had appeared over the rock rim. They hooked over the edge; and leisurely, with grim surety of invulnerability, the barrel-like head of a Quabo balanced itself on the ledge and glared at us.

* * * * *

For a moment we stared, paralyzed, at the Thing. And, during that moment it squatted there, as undistressed as though the air were its natural element, its gills flapping slowly up and down supplying it with oxygen.

The thing that held us rooted to the spot with fearful amazement was the fantastic device that permitted it to be almost as much at home in air as in water.

Over the great, globular head was set an oval glass shell. This was filled with water. A flexible metal tube hung down from the rear. Evidently it carried a constant stream of fresh water. As we gazed we saw intermittent trickles emerging from the bottom of the crystalline case.

Point for point the creature's equipment was the same as diving equipment used by men, only it was exactly opposite in function. A helmet that enabled a fish to breathe in air, instead of a helmet to allow a man to breathe in water!

Stanley was the first of us to recover from the shock of this spectacle. He faced about and raised his voice in shouts of warning to the resting Zyobites. For other glass encased monsters had appeared beside the first, now.

One by one, in single file like a line of enormous marching insects, they crawled down the wall and humped along on their tentacles--around the ditch and toward us!

* * * * *

The deadly infallibility of that second attack!

The Quabos advanced on us like armored tanks bearing down on defenceless savages. Their glass helmets, in addition to containing water for their breathing, protected them from our knives and axes. We were utterly helpless against them.

They marched in ranks about twenty yards apart, each rank helping the one in front to carry the cumbersome water-hoses which trailed back to the central water supply in the tunnel.

Their movements were slow, weighted down as they were by the great glass helmets, but they were appallingly sure.

We could not even retard their advance, let alone stop it. Here were no suffocating, faltering creatures. Here were beings possessed of their full vigor, each one equal to three of us even as the Professor had conjectured. Their only weak points were their tentacles which trailed outside the glass cases. But these they kept coiled close, so that to reach them and hack at them we had to step within range of their terrific clutches.

The Zyobites fought with the valor of despair added to their inherent noble bravery. Man after man closed with the monstrous, armored Things--only to be seized and crushed by the weaving tentacles.

Occasionally a terrific blow with an ax would crack one of the glass helmets. Then the denuded Quabo would flounder convulsively in the air till it drowned. But there were all too few of these individual victories. The main body of the Quabos, rank on rank, dragging their water-hose behind them, came on with the steadiness of a machine.

* * * * *

Slowly we were driven back down the broad street and toward the palace. As we retreated, old people and children came from the houses and went with us, leaving their dwellings to the mercy of the monsters.

A block from the palace we bunched together and, by sheer mass and ferocity, actually stopped the machinelike advance for a few moments. Miscellaneous weapons had been brought from the houses--sledges, stone benches, anything that might break the Quabos' helmets--and handed to us in silence by the noncombatants.

Somebody tugged at my sleeve. Looking down I saw a little girl. She had dragged a heavy metal bar out to the fray and was trying to get some fighter's attention and give it to him.

I seized the formidable weapon and jumped at the nearest Quabo, a ten-foot giant whose eyes were glinting gigantically at me through the distorting curve of the glass.

Disregarding the clutching tentacles entirely, I swung the bar against the helmet. It cracked. I swung again and it fell in fragments, spilling the gallons of water it had contained.

The tentacles wound vengefully around me, but in a few seconds they relaxed as the thing gasped out its life in the air.

* * * * *

I turned to repeat the process on another if I could, and found myself facing the Queen. Her head was held bravely high, though the violet of her eyes had gone almost black with fear and repulsion of the terrible things we fought.

"Aga!" I cried. "Why art thou here! Go back to the palace at once!"

"I came to fight beside thee," she answered composedly, though her delicate lips quivered. "All is lost, it seems. So shall I die beside thee."

I started to reply, to urge her again to seek the safety of the palace. But by now the deadly advance of the tentacled demons had begun once more.

Fighting vainly, the population of Zyobor was swept into the palace grounds, then into the building itself.

Men, women and children huddled shoulder to shoulder in the cramping quarters. An ironic picture came to me of the crowding masses of Quabos stuffed into the protection of the outer cave, waiting the outcome of the fight being waged by their warriors. Here were we in a similar circumstance, waiting for the battle to be decided. Though there was little doubt in the minds of any of us as to what the outcome would be.

Guards, the strongest men of the city, were stationed with sledges at the doors and windows. The Quabos, able only to enter one at a time, halted a moment and there was a badly needed breathing spell.

* * * * *

"We've got to find some drastic means of defence," said the Professor, "or we won't last another three hours."

"If you asked me, I'd say we couldn't last another three hours anyway," replied Stanley with a shrug. "These fish have out-thought us!"

"Nonsense! There may still be a way--"

"A brace of machine-guns...." I murmured hopefully.

"You might as well wish for a dozen light cannon!" snapped the Professor. "Please try to concentrate, and see if any effective weapon suggests itself to you--something more available at the moment than machine-guns."

In silence the three of us racked our brains for a means of defence. Aga, leaving for a time the task of soothing her more hysterical subjects, came quietly over to us and sat on the bench beside me.

Frankly I could think of nothing. To my mind we were surely doomed. What arms could possibly be contrived at such short notice? What weapon could be called forth to be effective against the thick glass helmets?

But as I glanced at Stanley I saw his face set in a new expression as his thoughts took a turn that suggested possible salvation.

"Glass," he muttered. "Glass. What destroys it? Sharp blows ... certain acids ... variation in temperature ... heat and cold.... That's it! _That's it!_"

He turned excitedly to the Queen.

"I think we have it! At least it's worth trying. If there is any tubing around...." He stopped as he realized he was talking in English, and resumed stiltedly in Aga's own language.

"Hast thou, in the palace, any lengths of pipe like to that which the Quabos drag behind them?"

"No ..." Aga began, her eyes round and wondering. Then she interrupted herself. "Ah, yes! There is! In a vault near that of Kilor's there is a great spool of it. He had it fashioned to carry air for one of his experiments--"

"Come along!" cried Stanley. "I'll explain what I have in mind while we dig up this coil of hose."

* * * * *

A score of Zyobite workmen were gathered at once. The length of hose--made of some linen-like fabric of tough, shredded sea-weed and covered with a flexible metal sheath--was cut into three pieces each about fifty yards long. These were connected to three of the largest gas vents of the palace.

Stanley, the Professor and I each took an end. And we prepared to fight, with fire, the creatures of water.