In the morning they hauled the tug alongside the wreck and at low-water rigged a derrick and opened the fore hatch. The palm kernels had rotted and a horrible pulpy mass, swollen by fermentation, rose nearly to the ledge. It was glutinous and too thick for the pump to lift, since the water that filled the vessel drained away through the broken plates as the tide sank. Brown, kneeling on the hatch-coaming, knitted his brows.

"The stuff's water-borne, forced up by its buoyancy," he said. "We may find it looser as we get down. In the meantime, suction's no use; we have got to break it out by hand. Start your winch and we'll fill the skip."

Lister signaled a man on board the tug, the winch rattled, and a big iron bucket, hanging by a wire rope, dropped into the hold. A gang of men climbed across the ledge and began to cut the slimy mass with spades. The surface heaved beneath them like a treacherous bog and the smell was horrible. Now and then a spade made an opening for the gases to escape and the nauseated men were driven back. For all that, they filled the skip and the swinging derrick carried the load across the deck and tilted it overboard.

The heat was almost unbearable, the reflections from the oily swell and wet deck hurt one's eyes, and Lister noted that the deck did not dry until the sea breeze began to blow. The wind brought a faint coolness and drove back the smell, but the men's efforts presently got slack. The labor was exhausting and one must wear some clothes because the sun burned one's skin. They held out until the rising water drove them from the hatch and when they went back to the tug Brown looked thoughtful.

"The men can't keep it up; the thing's impossible! A week like this would knock out the lot," he said. "We must use native boys and I'm going to get some."

In the morning Lister took his first diving lesson, and when the big copper helmet was screwed on and the air began to swell his canvas clothes, he shrank from the experiment. The load of metal he carried was crushing, he could hardly drag his weighted boots across the deck, and at the top of the ladder he hesitated, watching the bubbles that marked the spot where the diver had vanished. Then he remembered his promise to Barbara and cautiously went down.

The dazzling sunshine vanished, a wave of misty green closed above the helmet glass, hot compressed air blew about his head, and his ear-drums began to throb. Then lead and copper lost their weight; he felt buoyant and clung to the steps. At the bottom he was for a few moments afraid to let go, but an indistinct, monstrous object came out of the strange green gloom and beckoned him on. Lister went, making an effort for balance, because he now felt ridiculously light. Then the reflections were puzzling, for the light came and went with the rise and fall of the swell. Yet he could see and he followed the diver until they stopped opposite the wreck's port bilge. Her side went up like a dark wall, covered by waving weed.

Lister's head ached and his breathing was labored, but not much pressure was needed to keep out the shallow water and the diver had promised to warn him when they had stayed long enough. He forced himself to examine the plate the other indicated. Arcturus was a butt-strapped vessel and a number of the straps had burst. Plates were smashed and some of the holes were large, but in places the iron was drilled and in others patches had been bolted on. The salvage company had done part of this work and he thought it possible to make the damage good. If they could stop the remaining holes, the big pump ought to throw out the water; but Cartwright had talked about another opening and this would be awkward to reach.

Signing the diver to go on, he followed him round the vessel's stern. The sand on the other side was high and one could climb on board, but Lister shrank from the dark alleyway that led to the engine-room. For all that, he went in and saw the diver had opened the jambed door. When he reached the ledge a flash from the other's electric lamp pierced the gloom and he tried to forget his throbbing head and looked about.

Sparkling bubbles from his and the diver's helmets floated straight up to the skylights, along which they glided and vanished through a hole in the glass. The water, moving gently with the pulse of the swell, broke the beam of light and objects it touched were distorted and magnified. The top of the big low-pressure cylinder looked gigantic, and the thick columns appeared to bend. Long weed clung to the platforms, from which iron ladders went down, but so far as Lister could distinguish, all below was buried in sand.