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and our camp days at McMurdo Sound that we shuddered to think of it here, where such things ought not to be. To be brief⁠—it was simply the raucous squawking of a penguin.

The muffled sound floated from subglacial recesses nearly opposite to the corridor whence we had come⁠—regions manifestly in the direction of that other tunnel to the vast abyss. The presence of a living water bird in such a direction⁠—in a world whose surface was one of age-long and uniform lifelessness⁠—could lead to only one conclusion; hence our first thought was to verify the objective reality of the sound. It was, indeed, repeated, and seemed at times to come from more than one throat.

Seeking its source, we entered an archway from which much debris had been cleared; resuming our trail blazing⁠—with an added paper supply taken with curious repugnance from one of the tarpaulin bundles on the sledges⁠—when we left daylight behind.

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 aerial survey as remarkably well-preserved. Along our path the single torch showed a customary profusion of carvings, but we did not pause to examine any of these.

Suddenly a bulky white shape loomed up ahead of us, and we flashed on the second torch. It is odd how wholly this new quest had turned our minds from earlier fears of what might lurk near. Those other ones,