Thorvald's gaze followed his pointing finger and then before Shann could protest, the officer leaped outward from their perch on the cliff to the broad rock where the scaled sea dweller had lain moments earlier. He stood there, watching that drifting object with the closest attention, as Shann made the same crossing in his wake. The drifting thing was oval, perhaps some six feet long and three wide, the mid point rising in a curve from the water's edge. As far as Shann could make out in the half-light the color was a reddish-brown, the surface rough. And he thought by the way that it moved that it must be flotsam of the storm, buoyant enough to ride the waves with close to cork resiliency. To Shann's dismay his companion began to strip. "What are you going to do?" "Get that." Shann surveyed the water about the rock. The forked tail had sunk just there. Was the Survey officer mad enough to think he could swim unmenaced through a sea which might be infested with more such creatures? It seemed that he was, for Thorvald's white body arched out in a dive. Shann waited, half crouched and tense, as though he could in some way attack anything rising from the depths to strike at his companion. A brown arm flashed above the surface. Thorvald swam strongly toward the floating object. He reached it, his outstretched hand rasping across the surface. And it responded so quickly to that touch that Shann guessed it was even lighter and easier to handle than he had first thought. Thorvald headed back, herding the thing before him. And when he climbed out on the rock, Shann was pulling up his trophy. They flipped the find over, to discover it hollow. They had, in effect, a ready-made craft not unlike a canoe with blunted bows. But the substance was surely organic: Was it shell? Shann speculated, running his finger tips over the irregular surface. The Survey officer dressed. "We have our boat," he commented. "Now for Utgard--" Use this frail thing to dare the trip to the islands? But Shann did not protest. If the officer determined to try such a voyage, he would do it. And neither did the younger man doubt that he would accompany Thorvald. 9. ONE ALONE Once again the beach was a wide expanse of shingle, drying fast under a sun hotter than any Shann had yet known on Warlock. Summer had taken a big leap forward. The Terrans worked in partial shade below a cliff overhang, not only for the protection against the sun's rays, but also as a precaution against any roving Throg air patrol. Under Thorvald's direction the curious shell dragged from the sea--if it were a shell, and the texture as well as the general shape suggested that--was equipped with a framework to act as a stabilizing outrigger. What resulted was certainly an odd-looking craft, but one which obeyed the paddles and rode the waves easily.