Immediately Bond understood why all these barracuda and shark were lurking round the island, how they were kept frenzied with bloodlust by this nightly banquet, why, against all reason, the three men had been washed up half–eaten by the fish.

Mr Big had just harnessed the forces of the sea for his protection. It was a typical invention - imaginative, technically fool - proof and very easy to operate.

Even as Bond's mind grasped it all, something hit him a terrific blow in the shoulder and a twenty-pound barracuda backed away, black rubber and flesh hanging from its jaws. Bond felt no pain as he let go of the bronze propeller and threshed wildly for the rocks, only a horrible sickness in the pit of his stomach at the thought of part of himself between those hundred razor-sharp teeth. Water started to ooze between the close-fitting rubber and his skin. It would not be long before it penetrated up his neck and into the mask.

He was just going to give up and shoot the twenty feet to the surface when he saw a wide fissure in the rocks in front of him. Beside it a great boulder lay on its side and somehow he got behind it. He turned from the partial shelter it gave just in time to see the same barracuda coming at him again, its upper jaw held at right angles to the lower for its infamous gaping strike.

Bond fired almost blind with the harpoon gun. The rubber thongs whammed down the barrel and the barbed harpoon caught the big fish in the centre of its raised upper jaw, pierced it and stuck with half the shaft and the line still free.

The barracuda stopped dead in its tracks, three feet from Bond's stomach. It tried to get its jaws together and then gave a mighty shake of its long reptile's head. Then it shot away, zigzagging madly, the gun and line, jerked from Bond's hand, streaming behind it. Bond knew that the other fish would be on to it, tearing it to bits, before it had gone a hundred yards.

Bond thanked God for the diversion. His shoulder was now surrounded by a cloud of blood. In a matter of seconds the other fish would catch the scent. He slipped round the boulder with the thought that he would scramble up under the shelter of the jetty and somehow hide himself above the level of the sea until he had made a fresh plan.

Then he saw the cave that the boulder had hidden.