While the wreckers were busily discharging the ship's cargo, her own crew were overhauling long lines of chain cable, and lowering two large anchors and two smaller ones into one of the wrecking boats that had remained empty on purpose to receive them. The cables were paid out over the stern of the ship, and made fast to the great anchors, which were carried far out into the deep water beyond the reef. Each big anchor was backed by a smaller one, to which it was attached by a cable, and which was carried some distance beyond it before being dropped overboard. When the anchors were thus placed in position, the ends of the cables still remaining on board the ship were passed around capstans, and by means of the donkey-engine drawn taut. At high tide that night a heavy strain was brought to bear on the cables, in hopes that the ship might be pulled off the reef; but she did not move, and the work of lightening her and searching for the leak continued all the next day. While all this work was going on the Elmers spent most of their time in exploring the reef in the captain's gig, which was so light that Mr. Elmer and Mark could easily row it. As the clear water was without a ripple, they could look far down into its depths, and see the bottom of branching coral, as beautiful as frosted silver. From among its branches sprang great sea-fans, delicate as lace-work, and showing, in striking contrast to the pure white of the coral, the most vivid reds, greens, and royal purple. These, and masses of feathery seaweeds, waved to and fro in the water as though stirred by a light breeze, and among them darted and played fish as brilliant in coloring as tropical birds. The boat seemed suspended in midair above fairy-land, and even the children gazed down over its sides in silence, for fear lest by speaking they should break the charm, and cause the wonderful picture to vanish. By noon the heat of the sun was so great that they sought shelter from it on a little island, or key, of about an acre in extent, that was covered with a luxuriant vegetation, and shaded by a group of stately cocoa-nut palms. Mr. Elmer showed Mark how to climb one of these by means of a bit of rope fastened loosely around his body and the smooth trunk of the tree, and the boy succeeded in cutting off several bunches of the great nuts that hung just below the wide-spreading crown of leaves. They came to the ground with a crash, but the thick husk in which each was enveloped saved them from breaking. The nuts were quite green, and Mr. Elmer with a hatchet cut several of them open and handed them to his wife and children. None of them contained any meat, for that had not yet formed, but they were filled with a white, milky fluid, which, as all of the party were very thirsty, proved a most acceptable beverage.