The court was paved with yellow Roman brick, and moderately spacious. An oblong curbing in the centre without rails marked the place of descent to the water. Overhead there was nothing to interfere with the fall of light from the blue sky, except that in one corner a shed had been constructed barely sufficient to protect a sedan chair deposited there, its poles on end leant against the wall. Sergius noticed the chair and the poles, then looked down over the curbing into a doorway, and saw four stone steps leading to a platform three or four feet square. Observing a further descent, he went down to the landing, where he paused long enough to be satisfied that the whole stairway was built into the eastern wall of the cistern. The light was already dim. Proceeding carefully, for the stones were slippery, he counted fourteen steps to another landing, the width of the first but quite ten feet long, and slightly submerged with water. Here, as he could go no further, he stopped to look about him.
It is true there was not much to be seen, yet he was at once impressed with a sense of vastness and durability. A dark and waveless sheet lay stretched before him, merging speedily into general blackness. About four yards away and as many apart, two gigantic pillars arose out of the motionless flood stark and ghostly gray. Behind them, suggestive of rows with an aisle between, other pillars were seen, mere upright streaks of uncertain hue fainter growing in the shadowy perspective. Below there was nothing to arrest a glance. Raising his eyes to the roof above him, out of the semi-obscurity, he presently defined a brick vault springing boldly from the Corinthian capitals of the nearest pillars, and he knew straightway the roof was supported by a system of vaults susceptible of indefinite extension. But how was he, standing on a platform at the eastern edge of the reservoir, mighty in so many senses, to determine its shape, width, length? Stooping he looked down the vista straining his vision, but there was no opposite wall—only darkness and impenetrability. He filled his lungs trying the air, and it was damp but sweet. He stamped with force—there was a rumble in the vault overhead—that was all. He called: "Lael, Lael"—there was no answer, though he listened, his soul in his ears. Therewith he gave over trying to sound the great handmade cavern, and lingered awhile muttering:
"It is possible, it is possible! At the end of this row of pillars"—he made a last vain effort to discover the end—"there may be a house afloat, and she"—he clinched his hands, and shook with a return of murderous passion—"God help her! Nay, God help me! If she is here, as I believe, I will find her."
In the court he again noticed the sedan in the corner.
"I am obliged to you," he said to the keeper by the door. "How old is the cistern?"
"Constantine begun it, and Justinian finished it, they say."
"Is it in use now?"
"They let buckets down through traps in the roof."
"Do you know how large it is?" [Footnote: Yere Batan Serai, or the Underground Palace, the ancient Royal Cistern, or cistern of Constantine, is in rank, as well as in interest and beauty, the chief Byzantine cistern. It is on the right-hand side of the tramway street, west of St. Sophia. The entrance is in the yard of a large Ottoman house in last street on the right of tramway street before the tramway turns abruptly west (to right) after passing St. Sophia.
This cistern was built by Constantine the Great, and deepened and enlarged by Justinian the Great in 527, the first year of his reign. It has been in constant use ever since. The water is supplied from unknown and subterranean sources, sometimes rising nearly to the capitals of the columns. It is still in admirable preservation: all its columns are in position, and almost the entire roof is intact. The columns are arranged in twelve rows of twenty-eight, there being in all three hundred and thirty-six, which are twelve feet distant from each other or from the wall. Some of the capitals are Corinthian; others plain, hardly more than truncated pyramids. The roof consists of a succession of brick vaults.