I suggested. "It would be a stern and awful retribution, Phaidor; but a just one."
"I cannot believe it," she said.
"We shall see," I answered, and then we fell silent again for we were rapidly approaching the black mountain, which in some indefinable way seemed linked with the answer to our problem.
As we neared the dark, truncated cone the vessel's speed was diminished until we barely moved. Then we topped the crest of the mountain and below us I saw yawning the mouth of a huge circular well, the bottom of which was lost in inky blackness.
The diameter of this enormous pit was fully a thousand feet. The walls were smooth and appeared to be composed of a black, basaltic rock.
For a moment the vessel hovered motionless directly above the center of the gaping void, then slowly she began to settle into the black chasm. Lower and lower she sank until as darkness enveloped us her lights were thrown on and in the dim halo of her own radiance the monster battleship dropped on and on down into what seemed to me must be the very bowels of Barsoom.
For quite half an hour we descended and then the shaft terminated abruptly in the dome of a mighty subterranean world. Below us rose and fell the billows of a buried sea. A phosphorescent radiance illuminated the scene. Thousands of ships dotted the bosom of the ocean. Little islands rose here and there
