疯狂山脉（X）(3)

As the glaciated floor gave place to a litter of detritus, we plainly discerned some curious dragging tracks; and once Danforth found a distinct print of a sort whose description would be only too superfluous. The course indicated by the penguin cries was precisely what our map and compass prescribed as an approach to the more northerly tunnel-mouth, and we were glad to find that a bridgeless thoroughfare on the ground and basement levels seemed open. The tunnel, according to the chart, ought to start from the basement of a large pyramidal structure which we seemed vaguely to recall from our aërial survey as remarkably well preserved. Along our path the single torch shewed a customary profusion of carvings, but we did not pause to examine any of these.