I heard a little exclamation of surprise from Xodar, followed by a grim laugh. The boy laughed too and said something which I could not catch for the whistling of the wind of our awful speed.

I looked above my head, hoping to catch the gleam of stars by which I could direct our course and hold the hurtling thing that bore us true to the centre of the shaft. To have touched the side at the speed we were making would doubtless have resulted in instant death for us all. But not a star showed above—only utter and impenetrable darkness.

Then I glanced below me, and there I saw a rapidly diminishing circle of light—the mouth of the opening above the phosphorescent radiance of Omean. By this I steered, endeavouring to keep the circle of light below me ever perfect. At best it was but a slender cord that held us from destruction, and I think that I steered that night more by intuition and blind faith than by skill or reason.

We were not long in the shaft, and possibly the very fact of our enormous speed saved us, for evidently we started in the right direction and so quickly were we out again that we had no time to alter our course. Omean lies perhaps two miles below the surface crust of Mars. Our speed must have approximated two hundred miles an hour, for Martian fliers are swift, so that at most we were in the shaft not over forty seconds.

We must have been out of it for some seconds before I realised that we had accomplished the impossible. Black darkness enshrouded all about us. There were neither moons nor stars. Never before had I seen such a thing upon Mars, and for the moment I was nonplussed. Then the explanation came to me. It was summer at the south pole. The ice cap was melting and those meteoric phenomena, clouds, unknown upon the greater part of Barsoom, were shutting out the light of heaven from this portion of the planet.

Fortunate indeed it was for us, nor did it take me long to grasp the opportunity for escape which this happy condition offered us. Keeping the boat's nose at a stiff angle I raced her for the impenetrable curtain which Nature had hung above this dying world to shut us out from the sight of our pursuing enemies.

We plunged through the cold damp fog without diminishing our speed, and in a moment emerged into the glorious light of the two moons and the million stars. I dropped into a horizontal course and headed due north. Our enemies were a good half-hour behind us with no conception of our direction. We had performed the miraculous and come through a thousand dangers unscathed—we had escaped from the land of the First Born. No other prisoners in all the ages of Barsoom had done this thing, and now as I looked back upon it it did not seem to have been so difficult after all.

I said as much to Xodar, over my shoulder.

"It is very wonderful, nevertheless," he replied. "No one else could have accomplished it but John Carter."

At the sound of that name the boy jumped to his feet.