"Looks like it, but they probably know their stuff." He pressed her hand reassuringly. "Now, Peg, no matter what happens, stick to me as long as you possibly can!" As Seaton had noticed, the city toward which they were flying resembled somewhat an enormous pyramid, whose component units were themselves mighty buildings, towering one above and behind the other in crenelated majesty to an awe-inspiring height. In the wall of the foundation tier of buildings there yawned an enormous opening, spanned by a noble arch of metaled masonry, and out of this gloriously arched aqueduct there sprang the stream whose course the airship had been following so long. Toward that forbidding opening the hypership planed down, and into it she floated slowly and carefully. * * * * * Much to the surprise of the Terrestrials, however, the great tunnel of the aqueduct was not dark. Walls and arched ceiling alike glowed with the livid, bluish-violet ultra-light which they had come to regard as characteristic of all hyperthings, and through that uncanny glare the airship stole along. Once inside the tunnel its opening vanished--imperceptible, indistinguishable from its four-dimensional, black-and-livid-blue background. Unending that tunnel stretched before and behind them. Walls and watery surface alike were smooth, featureless, and so uniformly and weirdly luminous that the eye could not fix upon any point firmly enough to determine the rate of motion of the vessel--or even to determine whether it was moving at all. No motion could be perceived or felt and the time-sense had long since failed. Seaton and Margaret may have traveled in that gigantic bore for inches or for miles of distance; for seconds or for weeks of hypertime; they did not then and never did know. But with a slight jar the hypership came to rest at last upon a metallic cradle which had in some fashion appeared beneath her keel. Doors opened and the being holding the tridents, who had not moved a muscle during the, to the Terrestrials, interminable journey, made it plain to them that they were to precede him out of the airship. They did so, quietly and without protest, utterly helpless to move save at the behest of their unhuman captor-guide. Through a maze of corridors and passages the long way led. Each was featureless and blank, each was lighted by the same eerie, bluish light, each was paved with a material which, although stone-hard to the hypermen, yielded springily, as yields a soft peat bog, under the feet of the massive Terrestrials. Seaton, although now restored to full vigor, held himself rigorously in check. Far from resisting the controlling impulses of the trident he sought to anticipate those commands.