For a few minutes we continued rapidly up the steep grade, which I hoped would soon bring us quickly to the upper pits that let into the Temple of Issus. But I was to meet with a cruel disappointment.

Suddenly I heard a cry of "fire" far ahead, followed almost at once by cries of terror and the loud commands of dwars and padwars who were evidently attempting to direct their men away from some grave danger. At last the report came back to us. "They have fired the pits ahead." "We are hemmed in by flames in front and flood behind." "Help, John Carter; we are suffocating," and then there swept back upon us at the rear a wave of dense smoke that sent us, stumbling and blinded, into a choking retreat.

There was naught to do other than seek a new avenue of escape. The fire and smoke were to be feared a thousand times over the water, and so I seized upon the first gallery which led out of and up from the suffocating smoke that was engulfing us.

Again I stood to one side while the soldiers hastened through on the new way. Some two thousand must have passed at a rapid run, when the stream ceased, but I was not sure that all had been rescued who had not passed the point of origin of the flames, and so to assure myself that no poor devil was left behind to die a horrible death, unsuccoured, I ran quickly up the gallery in the direction of the flames which I could now see burning with a dull glow far ahead.

It was hot and stifling work, but at last I reached a point where the fire lit up the corridor sufficiently for me to see that no soldier of Helium lay between me and the conflagration—what was in it or upon the far side I could not know, nor could any man have passed through that seething hell of chemicals and lived to learn.

Having satisfied my sense of duty, I turned and ran rapidly back to the corridor through which my men had passed. To my horror, however, I found that my retreat in this direction had been blocked—across the mouth of the corridor stood a massive steel grating that had evidently been lowered from its resting-place above for the purpose of effectually cutting off my escape.

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?