For a moment we rolled helplessly about the whirling cylinder's interior, about the upmost section, and in that moment all thought of battle had left us. Then, as I felt Marlin and the Neptunian leader and the stunned guard rolling with me indiscriminately, I was aware, too, of cries from the cylinder's other sections and of Neptunians drawing themselves up to the upmost section on the ladder. Abruptly, in a moment more the cylinder steadied, hung poised and upright as before, and then as Marlin and I scrambled to our feet we saw that a trio of the Neptunians beneath had made their way up to the upmost section, despite the cylinder's whirling, by means of their multiple limbs, and that while one now held the controls the other two had their tubes trained once more full upon us! Our wild attempt at escape had failed, it was evident, for now, as the Neptunian leader of the crimson circle rose, he was addressing to the others a sharp, snapping order, and at the same time motioning Marlin and me peremptorily to the seats we had formerly occupied. We took them with no further resistance, for we knew that our desperate outbreak had put the Neptunians upon their guard and that the slightest suspicious motion on our part might well mean instant death. And as we seated ourselves once more with the guards on either side, one from beneath replacing the one I had killed, the despair that formerly had filled us seemed immeasurably intensified. For now the cylinder was sinking down after the others, through the great opening in Triton's roof, and even as Marlin and I looked outward we saw the great opening in that roof closing again above us with a clang that to our ears was like the clang of doom. Above our sinking cylinders now there stretched the great roof, and, even as Neptune's enclosing roof, this one was almost entirely transparent from below, though opaque from above. And here as on Neptune we could see no supporting pillars whatever for this vast spherical roof that enclosed all Triton. This world seemed, indeed, but a smaller replica of mighty Neptune. For, as our cylinders sank down through the shadows of its darker side and then leveled out and began to race back around its curving surface toward the sunward side once more, we saw that all of Triton's surface was covered, even like Neptune, with a great compartment-city whose intersecting black walls stretched in their vast checkerboard arrangement over all the great moon's surface. But as our cylinders shot over these, over the darkened portion of the surface of Triton and toward the sunward side, we saw that the compartment-city beneath was different, in some features, from that of Neptune.