That our principal movements were known to the First Born I could not have doubted, in view of the attack of the fleet upon us the day before, nor could the stopping of the pumps of Omean at the psychological moment have been due to chance, nor the starting of a chemical combustion within the one corridor through which we were advancing upon the Temple of Issus been due to aught than well-calculated design.
And now the dropping of the steel gate to pen me effectually between fire and flood seemed to indicate that invisible eyes were upon us at every moment. What chance had I, then, to rescue Dejah Thoris were I to be compelled to fight foes who never showed themselves. A thousand times I berated myself for being drawn into such a trap as I might have known these pits easily could be. Now I saw that it would have been much better to have kept our force intact and made a concerted attack upon the temple from the valley side, trusting to chance and our great fighting ability to have overwhelmed the First Born and compelled the safe delivery of Dejah Thoris to me.
The smoke from the fire was forcing me further and further back down the corridor toward the waters which I could hear surging through the darkness. With my men had gone the last torch, nor was this corridor lighted by the radiance of phosphorescent rock as were those of the lower levels. It was this fact that assured me that I was not far from the upper pits which lie directly beneath the temple.
Finally I felt the lapping waters about my feet. The smoke was thick behind me. My suffering was intense. There seemed but one thing to do, and that to choose the easier death which confronted me, and so I moved on down the corridor until the cold waters of Omean closed about me, and I swam on through utter blackness toward—what?
The instinct of self-preservation is strong even when one, unafraid and in the possession of his highest reasoning faculties, knows that death—positive and unalterable—lies just ahead. And so I swam slowly on, waiting for my head to touch the top of the corridor, which would mean that I had reached the limit of my flight and the point where I must sink forever to an unmarked grave.
But to my surprise I ran against a blank wall before I reached a point where the waters came to the roof of the corridor. Could I be mistaken? I felt around. No, I had come to the main corridor, and still there was a breathing space between the surface of the water and the rocky ceiling above. And then I turned up the main corridor in the direction that Carthoris and the head of the column had passed a half-hour before. On and on I swam, my heart growing lighter at every stroke, for I knew that I was approaching closer and closer to the point where there would be no chance that the waters ahead could be deeper than they were about me. I was positive that I must soon feel the solid floor beneath my feet again and that once more my chance would come to reach the Temple of Issus and the side of the fair prisoner who languished there.
But even as hope was at its highest I felt the sudden shock of contact as my head struck the rocks above. The worst, then, had come to me. I had reached one of those rare places where a Martian tunnel dips suddenly to a lower level. Somewhere beyond I knew that it rose again, but of what value was that to me, since I did not know how great the distance that it maintained a level entirely beneath the surface of the water!
There was but a single forlorn hope, and I took it. Filling my lungs with air, I dived beneath the surface and swam through the inky, icy blackness on and on along the submerged gallery. Time and time again I rose with up-stretched hand, only to feel the disappointing rocks close above me.
Not for much longer would my lungs withstand the strain upon them. I felt that I must soon succumb, nor was there any retreating now that I had gone this far. I knew positively that I could never endure to retrace my path now to the point from which I had felt the waters close above my head. Death stared me in the face, nor ever can I recall a time that I so distinctly felt the icy breath from his dead lips upon my brow.
One more frantic effort I made with my fast ebbing strength. Weakly I rose for the last time—my tortured lungs gasped for the breath that would fill them with a strange and numbing element, but instead I felt the revivifying breath of life-giving air surge through my starving nostrils into my dying lungs. I was saved.
A few more strokes brought me to a point where my feet touched the floor, and soon thereafter I was above the water level entirely, and racing like mad along the corridor searching for the first doorway that would lead me to Issus. If I could not have Dejah Thoris again I was at least determined to avenge her death, nor would any life satisfy me other than that of the fiend incarnate who was the cause of such immeasurable suffering upon Barsoom.
Sooner than I had expected I came to what appeared to me to be a sudden exit into the temple above. It was at the right side of the corridor, which ran on, probably, to other entrances to the pile above.
To me one point was as good as another. What knew I where any of them led! And so without waiting to be again discovered and thwarted, I ran quickly up
