"Come," he said. "Follow me," and starting off we were soon crossing the bed of the lake, being compelled to advance cautiously owing to the slippery nature of the weeds and water-plants that overgrew the stones. On gaining the island, however, a fresh surprise awaited me, for Omar, halting amid the mud in the centre, exclaimed:
"Watch carefully, Scars. You may some day desire to act as I am acting; but always remember that here any undue hurry means inevitable death."
"Death! What do you mean?"
"Wait, and you shall see," he replied, as stooping suddenly he turned up the sleeves of his royal robe and groping with his hand in the mud, at last discovered an iron ring, green with slime, which, grasping with both hands, he slowly twisted many times. A hissing sound was emitted, as if the action of untwisting the ring relieved some heavy pressure, admitting air to a chamber that had been hermetically sealed. This surmise was, I afterwards learned, correct. The unscrewing of this ring caused the sides of a plate embedded in the mud to contract, and air, so long excluded, entered the mysterious place below.
In a few moments, having paused to wipe the perspiration from his brow, Omar, again grasping the slippery ring, gave it a sudden jerk and by that means lifted the covering from a circular hole descending into an impenetrable darkness, but bricked round like a cottage well in England, and having projecting pieces of iron, forming steps.
"Now," exclaimed Omar, as together we peered into the mysterious opening. "To descend at once would mean certain death."
"How? Is the air below foul?"
"Not at all. The ingenuity of my ancestor who constructed this place made arrangements to avoid all that. The danger arises from a contrivance he devised by which any person attempting to explore it and being unaware of the means to guard against death, must be inevitably swept into eternity. Now, in order to give you an illustration of this danger I will show you the result of any adventurous person stepping down."
Taking from the mud a long iron bar, which he observed incidentally was kept there for the purpose of guarding against death, he reached down the shaft and placing the end of the bar upon the third step, threw his whole weight upon it, saying:
"We will suppose you have descended until your feet stand upon this step. Now, watch."