Gingerly I drew a long-sword from the rack. The scraping of the scabbard against its holder as I withdrew it sounded like the filing of cast iron with a great rasp, and I looked to see the room immediately filled with alarmed and attacking guardsmen. But none stirred.

The second sword I withdrew noiselessly, but the third clanked in its scabbard with a frightful din. I knew that it must awaken some of the men at least, and was on the point of forestalling their attack by a rapid charge for the doorway, when again, to my intense surprise, not a black moved. Either they were wondrous heavy sleepers or else the noises that I made were really much less than they seemed to me.

I was about to leave the rack when my attention was attracted by the revolvers. I knew that I could not carry more than one away with me, for I was already too heavily laden to move quietly with any degree of safety or speed. As I took one of them from its pin my eye fell for the first time on an open window beside the rack. Ah, here was a splendid means of escape, for it let directly upon the dock, not twenty feet from the water's edge.

And as I congratulated myself, I heard the door opposite me open, and there looking me full in the face stood the officer of the guard. He evidently took in the situation at a glance and appreciated the gravity of it as quickly as I, for our revolvers came up simultaneously and the sounds of the two reports were as one as we touched the buttons on the grips that exploded the cartridges.

I felt the wind of his bullet as it whizzed past my ear, and at the same instant I saw him crumple to the ground. Where I hit him I do not know, nor if I killed him, for scarce had he started to collapse when I was through the window at my rear. In another second the waters of Omean closed above my head, and the three of us were making for the little flier a hundred yards away.

Xodar was burdened with the boy, and I with the three long-swords. The revolver I had dropped, so that while we were both strong swimmers it seemed to me that we moved at a snail's pace through the water. I was swimming entirely beneath the surface, but Xodar was compelled to rise often to let the youth breathe, so it was a wonder that we were not discovered long before we were.

In fact we reached the boat's side and were all aboard before the watch upon the battleship, aroused by the shots, detected us. Then an alarm gun bellowed from a ship's bow, its deep boom reverberating in deafening tones beneath the rocky dome of Omean.

Instantly the sleeping thousands were awake. The decks of a thousand monster craft teemed with fighting-men, for an alarm on Omean was a thing of rare occurrence.

We cast away before the sound of the first gun had died, and another second saw us rising swiftly from the surface of the sea. I lay at full length along the deck with the levers and buttons of control before me. Xodar and the boy were stretched directly behind me, prone also that we might offer as little resistance to the air as possible.

"Rise high," whispered Xodar. "They dare not fire their heavy guns toward the dome-the fragments of the shells would drop back among their own craft. If we are high enough our keel plates will protect us from rifle fire."

I did as he bade. Below us we could see the men leaping into the water by hundreds, and striking out for the small cruisers and one-man fliers that lay moored about the big ships. The larger craft were getting under way, following us rapidly, but not rising from the water.

"A little to your right," cried Xodar, for there are no points of compass upon Omean where every direction is due north.

The pandemonium that had broken out below us was deafening. Rifles cracked, officers shouted orders, men yelled directions to one another from the water and from the decks of myriad boats, while through all ran the purr of countless propellers cutting water and air.

I had not dared pull my speed lever to the highest for fear of overrunning the mouth of the shaft that passed from Omean's dome to the world above, but even so we were hitting a clip that I doubt has ever been equalled on the windless sea.

The smaller fliers were commencing to rise toward us when Xodar shouted: "The shaft! The shaft! Dead ahead," and I saw the opening, black and yawning in the glowing dome of this underworld.

A ten-man cruiser was rising directly in front to cut off our escape. It was the only vessel that stood in our way, but at the rate that it was traveling it would come between us and the shaft in plenty of time to thwart our plans.

It was rising at an angle of about forty-five degrees dead ahead of us, with the evident intention of combing us with grappling hooks from above as it skimmed low over our deck.

There was but one forlorn hope for us, and I took it. It was useless to try to pass over her, for that would have allowed her to force us against the rocky dome above, and we were already too near that as it was. To have attempted to dive below her would have put us entirely at her mercy, and precisely where she wanted us. On either side a hundred other menacing craft were hastening toward us. The alternative was filled with risk-in fact it was all risk, with but a slender chance of success.

As we neared the cruiser I rose as though to pass above her, so that she would do just what she did do, rise at a steeper angle to force me still higher. Then as we were almost upon her I yelled to my companions to hold tight, and throwing the little vessel into her highest speed I deflected her bows at the same instant until we were running horizontally and at terrific velocity straight for the cruiser's keel.

Her commander may have seen my intentions then, but it was too late. Almost at the instant of impact I turned my bows upward, and then with a shattering jolt we were in collision. What I had hoped for happened. The cruiser, already tilted at a perilous angle, was carried completely over backward by the impact of my smaller vessel. Her crew fell twisting and screaming through the air to the water far below, while the cruiser, her propellers still madly churning, dived swiftly headforemost after them to the bottom of the Sea of Omean.

The collision crushed our steel bows, and notwithstanding every effort on our part came near to hurling us from the deck. As it was we landed in a wildly clutching heap at the very extremity of the flier, where Xodar and I succeeded in grasping the hand-rail, but the boy would have plunged overboard had I not fortunately grasped his ankle as he was already partially over.

Unguided, our vessel careened wildly in its mad flight, rising ever nearer the rocks above. It took but an instant, however, for me to regain the levers, and with the roof barely fifty feet above I turned her nose once more into the horizontal plane and headed her again for the black mouth of the shaft.

The collision had retarded our progress and now a hundred swift scouts were close upon us. Xodar had told me that ascending the shaft by virtue of our repulsive rays alone would give our enemies their best chance to overtake us, since our propellers would be idle and in rising we would be outclassed by many of our pursuers. The swifter craft are seldom equipped with large buoyancy tanks, since the added bulk of them tends to reduce a vessel's speed.

As many boats were now quite close to us it was inevitable that we would be quickly overhauled in the shaft, and captured or killed in short order.

To me there always seems a way to gain the opposite side of an obstacle. If one cannot pass over it, or below it, or around it, why then there is but a single alternative left, and that is to pass through it. I could not get around the fact that many of these other boats could rise faster than ours by the fact of their greater buoyancy, but I was none the less determined to reach the outer world far in advance of them or die a death of my own choosing in event of failure.