Never shall I forget that trip through the pits of Issus. While it was devoid of important incidents yet it was filled for me with a strange charm of excitement and adventure which I think must have hinged principally on the unguessable antiquity of these long-forgotten corridors. The things which the Stygian darkness hid from my objective eye could not have been half so wonderful as the pictures which my imagination wrought as it conjured to life again the ancient peoples of this dying world and set them once more to the labours, the intrigues, the mysteries and the cruelties which they had practised to make their last stand against the swarming hordes of the dead sea bottoms that had driven them step by step to the uttermost pinnacle of the world where they were now intrenched behind an impenetrable barrier of superstition.
In addition to the green men there had been three principal races upon Barsoom. The blacks, the whites, and a race of yellow men. As the waters of the planet dried and the seas receded, all other resources dwindled until life upon the planet became a constant battle for survival.
The various races had made war upon one another for ages, and the three higher types had easily bested the green savages of the water places of the world, but now that the receding seas necessitated constant abandonment of their fortified cities and forced upon them a more or less nomadic life in which they became separated into smaller communities they soon fell prey to the fierce hordes of green men. The result was a partial amalgamation of the blacks, whites and yellows, the result of which is shown in the present splendid race of red men.
I had always supposed that all traces of the original races had disappeared from the face of Mars, yet within the past four days I had found both whites and blacks in great multitudes. Could it be possible that in some far-off corner of the planet there still existed a remnant of the ancient race of yellow men?
My reveries were broken in upon by a low exclamation from the boy.
"At last, the lighted way," he cried, and looking up I beheld at a long distance before us a dim radiance.
As we advanced the light increased until presently we emerged into well-lighted passageways. From then on our progress was rapid until we came suddenly to the end of a corridor that let directly upon the ledge surrounding the pool of the submarine.
The craft lay at her moorings with uncovered hatch. Raising his finger to his lips and then tapping his sword in a significant manner, the youth crept noiselessly toward the vessel. I was close at his heels.
Silently we dropped to the deserted deck, and on hands and knees crawled toward the hatchway. A stealthy glance below revealed no guard in sight, and so with the quickness and the soundlessness of cats we dropped together into the main cabin of the submarine. Even here was no sign of life. Quickly we covered and secured the hatch.
Then the boy stepped into the pilot house, touched a button and the boat sank amid swirling waters toward the bottom of the shaft. Even then there was no scurrying of feet as we had expected, and while the boy remained to direct the boat I slid from cabin to cabin in futile search for some member of the crew. The craft was entirely deserted. Such good fortune seemed almost unbelievable.