The situation was instantly comprehended by every one. It was late in the afternoon; the captain had given a grand dinner to the passengers, at which the prima donna had appeared in all her glories of ornamentation, and the greatest of these glories, a magnificent diamond bracelet, was gone from the arm with which she had been enthusiastically waving her lace handkerchief. The second officer, who was standing near, dashed into the captain's office and quickly reappeared with chart and instruments, and made rapid calculation of the position of the vessel at the time of the accident, making an allowance for the few minutes that had passed since the first cry of the signora. After consultation with the captain and recalculations of the distance from land and some other points, he announced to the weeping signora that her bracelet lay under a little black spot he had made on the chart, and that if she chose to send a diver for it she might get it, for the depth of water at that place was not great. By profession I am a diver, and the next day I was engaged to search for the diamond bracelet of Signora Rochita. I had a copy of the chart, and, having hired a small schooner with several men who had been my assistants before, and taking with me all the necessary accouterments and appliances, I set out for the spot indicated, and by afternoon we were anchored, we believed, at or very near it. I lost no time in descending. I wore, of course, the usual diver's suit, but I took with me no tools nor any of the implements used by divers when examining wrecks, but carried in my right hand a brilliant electric lamp connected with a powerful battery on the schooner. I held this by an insulated handle, in which there were two little knobs, by which I could light or extinguish it. The bottom was hard and smooth, and lighting my lamp I began to look about me. If I approached the bracelet I ought to be able to see it sparkle, but after wandering over considerable space, I saw no sparkles nor anything like a bracelet. Suddenly, however, I saw something which greatly interested me. It was a hole in the bottom of the ocean, almost circular, and at least ten feet in diameter. I was surprised that I had not noticed it before, for it lay not far from the stern of our vessel. Standing near the rocky edge of the aperture, I held out my lamp and looked down. Not far below I saw the glimmer of what seemed to be the bottom of this subterranean well. I was seized with a desire to explore this great hole running down under the ordinary bottom of the sea. I signaled to be lowered, and although my comrades were much surprised at such an order, they obeyed, and down I went to the well. The sides of this seemed rocky and almost perpendicular, but after descending about fifteen feet they receded on every side, and I found myself going down into a wide cavern, the floor of which I touched in a very short time.