Captain Jules wished to take Madge out of the water immediately, yet he yielded for a minute to her disappointment. What treasures had they lost when he threw the mother-of-pearl shells away? Neither of them would ever know. The old diver looked about in the soft mud, while Madge raked furiously near the spot where she thought the sailor had dropped the shells. Captain Jules walked on for a little distance. He had seen beyond them a tangled mass of other shells and seaweed and it occurred to him that the water might have carried his shells into some hidden crevice nearby. But Madge never left her chosen spot. Deeper and deeper she dug. What a swirl of mud arose and eddied about her, darkening the clear water in which she stood! The little captain's hammer struck against something hard. Was it a rock embedded in the sand? Yet a distinct sound rang out, as of one metal striking against another! Madge did not know how she summoned Captain Jules back to her side. She was wild with curiosity and excitement. Captain Jules was smiling behind his copper mask. The young girl diver had probably found a piece of old iron cast off from some ship. Still, she should unearth whatever she had discovered so near the dark kingdom of Pluto. The captain worked with her. Whatever her find might be, it was larger and heavier than Captain Jules had expected. They could afford to spend no more time with it. It was time for Madge to leave the water. It is difficult to make an imploring gesture in a diver's suit. Yet, somehow, Madge must have managed to do so. For one moment longer the old pearl diver relented. The hole that they were digging in the bottom of the bay was widening before them. A chunk of what looked like solid iron was visible. Then a triangular end came into view. It was rusted until it shone like beautiful green enamel. The top was absolutely flat and of some depth, as it was so hard to excavate. The time was growing short. Madge had been under the water as long as was safe for any amateur diver. The captain was a man to be obeyed, as she knew instinctively. She gave one more dig into the mud about her iron treasure. It now became plain, both to her and to Captain Jules, that she had found an old iron chest. The captain tugged at it with both his great, strong hands. It was strangely heavy. But he managed to lift it in his arms.