It had buried itself in some crevice under the rock.
Gilliatt clutched the projections of the rock, and stretched out to observe where it shelved away under the water.
As he suspected, there was an opening there in which the creature had evidently taken refuge. It was more than a crevice; it was a kind of porch.
The sea entered beneath it, but was not deep. The bottom was visible, covered with large pebbles. The pebbles were green and clothed with confervæ, indicating that they were never dry. They were like the tops of a number of heads of infants, covered with a kind of green hair.
Holding his knife between his teeth, Gilliatt descended, by the help of feet and hands, from the upper part of the escarpment, and leaped into the water. It reached almost to his shoulders.
He made his way through the porch, and found himself in a blind passage, with a roof in the form of a rude arch over his head. The walls were polished and slippery. The crab was nowhere visible. He gained his feet and advanced in daylight growing fainter, so that he began to lose the power to distinguish objects.
At about fifteen paces the vaulted roof ended overhead. He had penetrated beyond the blind passage. There was here more space, and consequently more daylight. The pupils of his eyes, moreover, had dilated; he could see pretty clearly. He was taken by surprise.
He had made his way again into the singular cavern which he had visited in the previous month. The only difference was that he had entered by the way of the sea.
It was through the submarine arch, that he had remarked before, that he had just entered. At certain low tides it was accessible.
His eyes became more accustomed to the place. His vision became clearer and clearer. He was astonished. He found himself again in that extraordinary palace of shadows; saw again before his eyes that vaulted roof, those columns, those purple and blood-like stains, that vegetation rich with gems, and at the farther end, that crypt or sanctuary, and that altar-like stone. He took little notice of these details, but their impression was in his mind, and he saw that the place was unchanged.