"It does," he said, "and there's no reason why it shouldn't be. I've always thought that, as the air and water disappeared from the upper parts of the moon, the inhabitants, whoever they were, must have been driven down into the deeper parts. Shall we go down and see?"
"But how?" she said.
He pointed towards the Astronef. She nodded her helmeted head, and they went back towards the vessel.
A few minutes later the Space-Navigator had risen from her resting-place with an impetus which rapidly carried her over half of the vast crater, and then she began to drop slowly into the depths. She grounded gently, and presently they were standing on the ground about a mile from the central cone. This time, however, Redgrave had taken the precaution to bring a magazine rifle and a couple of revolvers with him in case any strange monsters, relics of the vanished fauna of the moon, might still be taking refuge in these mysterious depths. Zaidie, although like a good many American girls she could shoot excellently well, carried no weapon more offensive than the photographic apparatus aforesaid.
The first thing that Redgrave did when they stepped out on to the sandy surface of the plain was to stoop down and strike a wax match. There was a tiny glimmer of light, which was immediately extinguished.
"No air here," he said, "so we shall find no living beings—at any rate, none like ourselves."
They found the walking exceedingly easy, although their boots were purposely weighted in order to counteract, to some extent, the great difference in gravity. A few minutes brought them to the outskirts of the city. It had no walls and exhibited no signs of any devices for defence. Its streets were broad and well-paved, and the houses, built of great blocks of grey stone joined together with white cement, looked as fresh and unworn as though they had only been built a few months, whereas they had probably stood for hundreds of thousands of years. They were flat-roofed, all of one storey and practically of one type.
There were very few public buildings, and absolutely no attempt at ornamentation was visible. Round some of the houses were spaces which might once have been gardens. In the midst of the city, which appeared to cover an area of about four square miles, was an enormous square paved with flag-stones, which were covered to the depth of a couple of inches with a light grey dust, which, as they walked across it, remained perfectly still save for the disturbance caused by their footsteps. There was no air to support it, otherwise it might have risen in clouds about them.
From the centre of this square rose a huge pyramid nearly a thousand feet in height, the sole building of the great silent city which appeared to have been raised most probably as a temple by the hands of its long-dead inhabitants.
When they got nearer they saw a white fringe round the steps by which it was approached, and they soon found that this fringe was composed of millions of white-bleached bones and skulls, shaped very much like those of terrestrial men, save that they were very much larger, and that the ribs were out of all proportion to the rest of the skeleton.