He wondered at that, but only a little. Now they had brought him out upon an open, railed bridge between two buildings. Below was water, above the thick Venusian mist. "Jump," a Skygor bade him. "I need no second chance," Planter replied, breezily, and dived in. He still wore the scanty costume of a slave, and it allowed him to strike out easily for the edge of the pool. Behind him the Skygors were discussing him, but in their own guttural tongue which he could not understand. As he swam, he studied the city beneath the water. He meant to come back and assail that city some time, and there must be worthwhile secrets to note. For instance, he was now aware that this pool was artificial--he made out the sluices and gates of a large dam. To one side was a spacious submarine chamber that must be the clockwork-jammed cellar where his erstwhile companions, the slaves, worked. But something else was under water, something that moved darkly, but had arms and legs, though it was as vast as an elephant. It was approaching him swiftly, knowingly. Now he knew why he had been told, with such a voice of doom, to jump into the water. * * * * * Planter's blood was still up because of that brisk battle with Disbro. He was young, strong, in gilt-edge condition. His new impulse was to keep on fighting, against the thing which had the size, the intention, and apparently the appetite, to engulf him. The huge swimmer was a Skygor, of tremendous size. Logic in the back of Planter's head bade him not to be amazed; on this damp, fecund world, monsters of such sort were not too unthinkable. As it broke surface, he heard a hubbub like many steam sirens. The smaller Skygors, on housetops and bridges, were all chanting some sort of ear-bursting litany, waving their flippers in unison. Plainly they worshiped this giant of their race. He, Planter, was a gift--a sacrifice. He swam speedily, but his pursuer was speedier still. With ponderous overhand strokes it overhauled him. An arm as long as his body, with a flipper-hand like a tremendous scoop shovel, extended to clutch at him. A mouth like an open trunk gaped, large enough to gulp him bodily. Only one thing to do. He did it--dived at once, turning under water and darting below and in an opposite direction from the great swimmer. By pure, happy chance, his kicking feet struck the soft cushion of its mighty belly, and he heard the thrumming gasp of the wind he knocked out of it. Coming up beyond, he swam desperately toward a nearby building. If he could climb up, away, from this huge, hungry being. "No, not here!" That was a Skygor, poking its ugly smirking face from a window-hole. He tried to seize the sill to draw himself out of the water, and it lifted a dagger to slash at his knuckles.