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 for ever 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 upstretched 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 the short, steep incline and pushed open the doorway at its end.
The portal swung slowly in, and before it could be slammed against me I sprang into the chamber beyond. Although not yet dawn, the room was brilliantly lighted. Its sole occupant lay prone upon a low couch at the further side, apparently in sleep. From the hangings and sumptuous furniture of the room I judged it to be a living-room of some priestess, possibly of Issus herself.