"Well, that was noticeable. It was the only clean, bare stone to be seen. Every other was covered with a green growth, and to most clumps of weed clung. The obvious explanation of this was that the stone was a new-comer--lately brought from dry land--from the shingle on the sea-shore, probably, since it was washed so clean. Such a stone could not have come a mile out to sea by itself. Somebody had brought it in a boat and thrown it over, and whoever did it didn't take all that trouble for nothing. Then its shape told a tale; it was something of the form, rather exaggerated, of a loaf--the sort that is called a 'cottage'--the most convenient possible shape for attaching to a line and lowering. But the line had gone, so somebody must have been down there to detach it. Also it wasn't unreasonable to suppose that there might have been a hook on the end of that line. This, then, was a theory. Your man had gone down alone to take his measurement, had stepped into the broken side, as you have explained he could, reached into the bullion-room, and lifted the two cases. Probably he unfastened the cord, and brought them out one at a time for convenience in carrying. Then he carried the cases, one at a time, as I have said, over to that white stone which lay there sunk with the hook and line attached by previous arrangement with some confederate. He detached the rope from the stone--it was probably fixed by an attached piece of cord, tightened round the stone with what you call a timber-hitch, easily loosened--replaced the cord round the two cases, passed the hook under the cord, and left it to be pulled up from above. But then it could not have been pulled up there in broad daylight, under your very noses. The confederates would wait till night. That meant that the other end of the rope was attached to some floating object, so that it might be readily recovered. The whole arrangement was set one night to be carried away the next." "But why didn't Gullen take more than two cases?" "He couldn't afford to waste the time, in the first place. Each case removed meant another journey to and from the vessel, and you were waiting above for his measurements. Then he was probably doubtful as to weight. Too much at once wouldn't easily be drawn up, and might upset a small boat.