By a change of plan the year before, a deep hole nearly sixty feet in diameter had been made in the back of this turtle by lifting out these rough stones. This hole was now being filled with concrete up to low-water level and retained in form by circular iron bands. On top of this enormous artificial bedstone was to be placed the tower of the lighthouse itself, constructed of dressed stone, many of the single pieces to be larger than those now on the Screamer’s deck. The four great derrick-masts with “twenty-inch butts” which had been ordered by telegraph the day before in Sanford’s office were to be used to place these dressed stones in position. The situation was more than usually exposed. The nearest land to the Ledge was Crotch Island, two miles away, while to the east stretched the wide sea, hungry for fresh victims, and losing no chance to worst the men on the Ledge. For two years it had fought the captain and his men without avail. The Old Man of the Sea hates the warning voice of the fog-horn and the cheery light in the tall tower—they rob him of his prey. The tug continued on her course for half a mile, steered closer, the sloop following, and gained the eddy of the Ledge out of the racing tide. Four men from the platform now sprang into a whaleboat and pulled out to meet the sloop, carrying one end of a heavy hawser which was being paid out by the men on the Ledge. The hawser was made fast to the sloop’s cleats and hauled tight. The tug was cast loose and sent back to Keyport. Outboard hawsers were run by the crew of the whaleboat to the floating anchor-buoys, to keep the sloop off the stone-pile when the enrockment blocks were being swung clear of her sides. Caleb and Lacey began at once to overhaul the diving-gear. The air-pump was set close to the sloop’s rail; and a short ladder was lashed to her side, to enable the diver to reach the water easily. The air-hose and life-lines were then uncoiled. Caleb threw off his coat and trousers, that he might move the more freely in his diving-dress, and with Lonny Bowles’s assistance twisted himself into his rubber suit,—body, arms, and legs being made of one piece of air-tight and water-tight rubber cloth. By the time the sloop had been securely moored, and the boom-tackle made ready to lift the stone, Caleb stood on the ladder completely equipped, except for his copper helmet, the last thing done to a diver before he sinks under water. Captain Joe always adjusted Caleb’s himself. On Caleb’s breast and between his shoulders hung two lead plates weighing twenty-five pounds each, and on his feet were two iron-shod shoes of equal weight. These were needed as ballast, to overbalance the buoyancy of his inflated dress, and enable him to sink or rise at his pleasure. Firmly tied to his wrist was a stout cord,—his life-line,—and attached to the back of the copper helmet was a long rubber hose, through which a constant stream of fresh air was to be pumped inside his helmet and suit.