The gleam of daylight was fortunate.

One step further, and Gilliatt must have fallen into a pool, perhaps without bottom. The waters of these cavern pools are so cold and paralysing as to prove fatal to the strongest swimmers.

There is, moreover, no means of remounting or of hanging on to any part of their steep walls.

He stopped short. The crevice from which he had just issued ended in a narrow and slippery projection, a species of corbel in the peaked wall. He leaned against the side and surveyed it.

He was in a large cave. Over his head was a roofing not unlike the inside of a vast skull, which might have been imagined to have been recently dissected. The dripping ribs of the striated indentations of the roof seemed to imitate the branching fibres and jagged sutures of the bony cranium. A stony ceiling and a watery floor. The rippled waters between the four walls of the cave were like wavy paving tiles. The grotto was shut in on all sides. Not a window, not even an air-hole visible. No breach in the wall, no crack in the roof. The light came from below and through the water, a strange, sombre light.

Gilliatt, the pupils of whose eyes had contracted during his explorations of the dusky corridor, could distinguish everything about him in the pale glimmer.

He was familiar, from having often visited them, with the caves of Plémont in Jersey, the Creux-Maillé at Guernsey, the Boutiques at Sark; but none of these marvellous caverns could compare with the subterranean and submarine chamber into which he had made his way.

Under the water at his feet he could see a sort of drowned arch. This arch, a natural ogive, fashioned by the waves, was glittering between its two dark and profound supports. It was by this submerged porch that the daylight entered into the cavern from the open sea. A strange light shooting upward from a gulf.

The glimmer spread out beneath the waters like a large fan, and was reflected on the rocks. Its direct rays, divided into long, broad shafts, appeared in strong relief against the darkness below, and becoming brighter or more dull from one rock to another, looked as if seen here and there through plates of glass. There was light in that cave it is true; but it was the light that was unearthly. The beholder might have dreamed that he had descended in some other planet. The glimmer was an enigma, like the glaucous light from the eye-pupil of a Sphinx. The whole cave represented the interior of a death's-head of enormous proportions, and of a strange splendour. The vault was the hollow of the brain, the arch the mouth; the sockets of the eyes were wanting. The cavern, alternately swallowing and rendering up the flux and reflux through its mouth wide opened to the full noonday without, seemed to drink in the light and vomit forth bitterness; a type of some beings intelligent and evil. The light, in traversing this inlet through the vitreous medium of the sea-water, became green, like a ray of starlight from Aldebaran. The water, filled with the moist light, appeared like a liquid emerald. A tint of aqua-marina of marvellous delicacy spread a soft hue throughout the cavern. The roof, with its cerebral lobes, and its rampant ramifications, like the fibres of nerves, gave out a tender reflection of chrysoprase. The ripples reflected on the roof were falling in order and dissolving again incessantly, and enlarging and contracting their glittering scales in a mysterious and mazy dance. They gave the beholder an impression of something weird and spectral: he wondered what prey secured, or what expectation about to be realised, moved with a joyous thrill this magnificent network of living fire. From the projections of the vault, and the angles of the rock, hung lengths of delicate fibrous plants, bathing their roots probably through the granite in some upper pool of water, and distilling from their silky ends one after the other, a drop of water like a pearl. These drops fell in the water now and then with a gentle splash. The effect of the scene was singular. Nothing more beautiful could be imagined; nothing more mournful could anywhere be found.

It was a wondrous palace, in which death sat smiling and content.